Number

1,822

1,822 is a composite number, even, a calendar year.

1,822 (one thousand eight hundred twenty-two) is an even 4-digit number. It is a composite number with 4 divisors, and factors as 2 × 911. Written other ways, in Roman numerals it is MDCCCXXII and in binary, 11100011110.

Arithmetic Number Cube-Free Deficient Number Odious Number Pernicious Number Recamán's Sequence Semiprime Smith Number Squarefree Year

Interestingness

★ ★ ★ ★ ☆

6 notable facts · grade B

1,810 1,811 1,812 1,813 1,814 1,815 1,816 1,817 1,818 1,819 1,820 1,821 1,822 1,823 1,824 1,825 1,826 1,827 1,828 1,829 1,830 1,831 1,832 1,833 1,834

less more

Notable events — 1822 AD

Sep 7 Brazil declares independence from Portugal under Pedro I.
Aug 12 Liberian colony of Mesurado is founded as Monrovia.
Sep 27 Jean-François Champollion announces his decipherment of Egyptian hieroglyphs.
Feb 7 Tongan king Kau Ulufonua is converted to Christianity.
Apr 4 Pope Pius VII restores the Jesuits to several countries.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Tuesday
January 1, 1822
Ended on: Tuesday
December 31, 1822
Friday the 13ths: 2
2 Friday the 13ths this year.
Easter Sunday: April 7
Sunday, April 7, 1822
Decade: 1820s
1820–1829
Century: 19th century
1801–1900
Millennium: 2nd millennium
1001–2000
Years ago: 204
204 years before 2026.

In other calendars

Hebrew: 5582 / 5583 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 1237 / 1238 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Water zodiac:Horse
Sexagenary cycle position 19 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 2365 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 1200 / 1201 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1814 / 1815 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1744 / 1743 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 4
Digit sum: 13
Digit product: 32
Digital root: 4
Palindrome: No
Bit width: 11 bits
Reversed: 2,281
Recamán's sequence: a(8,100) = 1,822
Square (n²): 3,319,684
Cube (n³): 6,048,464,248
Divisor count: 4
σ(n) — sum of divisors: 2,736
φ(n) — Euler's totient: 910
Sum of prime factors: 913

Primality

Prime factorization: 2 × 911

Nearest primes: 1,811 (−11) · 1,823 (+1)

Divisors & multiples

All divisors (4)

1 · 2 · 911 (half) · 1822

Aliquot sum (sum of proper divisors): 914

Factor pairs (a × b = 1,822)

1 × 1822

2 × 911

First multiples

1,822 · 3,644 (double) · 5,466 · 7,288 · 9,110 · 10,932 · 12,754 · 14,576 · 16,398 · 18,220

Sums & aliquot sequence

As consecutive integers: 454 + 455 + 456 + 457

Aliquot sequence: 1,822 → 914 → 460 → 548 → 418 → 302 → 154 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Continued fraction of √n

√1,822 = [42; (1, 2, 5, 1, 3, 4, 2, 13, 1, 3, 1, 1, 3, 1, 1, 27, 1, 8, 1, 1, 11, 1, 2, 42, …)]

Period length 48 — the block in parentheses repeats forever.

Representations

In words: one thousand eight hundred twenty-two
Ordinal: 1822nd
Roman numeral: MDCCCXXII
Binary: 11100011110
Octal: 3436
Hexadecimal: 0x71E
Base64: Bx4=
One's complement: 63,713 (16-bit)
Scientific notation: 1.822 × 10³
As a duration: 1,822 s = 30 minutes, 22 seconds

In other bases

ternary (3) 2111111

quaternary (4) 130132

quinary (5) 24242

senary (6) 12234

septenary (7) 5212

nonary (9) 2444

undecimal (11) 1407

duodecimal (12) 107a

tridecimal (13) aa2

tetradecimal (14) 942

pentadecimal (15) 817

Palindromic in base 5

As an angle

1,822° = 5 × 360° + 22°

22° ≈ 0.384 rad

Compass bearing: NNE (north-northeast)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒌋 𒌋𒌋𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺
Greek (Milesian): ͵αωκβʹ
Mayan (base 20): 𝋤·𝋫·𝋢
Chinese: 一千八百二十二
Chinese (financial): 壹仟捌佰貳拾貳

In other modern scripts

Eastern Arabic ١٨٢٢ Devanagari १८२२ Bengali ১৮২২ Tamil ௧௮௨௨ Thai ๑๘๒๒ Tibetan ༡༨༢༢ Khmer ១៨២២ Lao ໑໘໒໒ Burmese ၁၈၂၂

Digit at this position in famous constants

π — Pi (π): Digit 1,822 = 3
e — Euler's number (e): Digit 1,822 = 3
φ — Golden ratio (φ): Digit 1,822 = 5
√2 — Pythagoras's (√2): Digit 1,822 = 3
ln 2 — Natural log of 2: Digit 1,822 = 6
γ — Euler-Mascheroni (γ): Digit 1,822 = 7

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1822, here are decompositions:

11 + 1811 = 1822
89 + 1733 = 1822
101 + 1721 = 1822
113 + 1709 = 1822
239 + 1583 = 1822
251 + 1571 = 1822
263 + 1559 = 1822
269 + 1553 = 1822

Showing the first eight; more decompositions exist.

Unicode codepoint

Syriac Letter Yudh He

U+071E

Other letter (Lo)

UTF-8 encoding: DC 9E (2 bytes).

Lookup U+071E on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00071E

RGB(0, 7, 30)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.30.

Address: 0.0.7.30
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.7.30

Unspecified address (0.0.0.0/8) — "this network" placeholder.

Musical pitch

Heard as a frequency, 1,822 Hz is closest to:

Concert pitch (A4 = 440 Hz): A♯6 (1864.7 Hz, -40¢)
Scientific pitch (C4 = 256 Hz): A♯6 (1824.6 Hz, -2¢)
Baroque pitch (A4 = 415 Hz): B6 (1863.3 Hz, -39¢)

Position in π

The digit sequence 1822 first appears in π at position 46,046 of the decimal expansion (the 46,046ordinal-suffix:th digit after the integer 3).

Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.

Look up 1822 on Pi Search ↗