Number

422

422 is a composite number, even, a calendar year.

Arithmetic Number Deficient Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 422 AD

Calendar year

Year 422 (CDXXII) was a common year starting on Sunday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

Historical context — 422 BC

Calendar year

Year 422 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

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: Saturday
January 1, 422
Ended on: Saturday
December 31, 422
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 420s
420–429
Century: 5th century
401–500
Millennium: 1st millennium
1–1000
Years ago: 1,604
1604 years before 2026.

In other calendars

Hebrew: 4182 / 4183 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Water zodiac:Dog
Sexagenary cycle position 59 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 965 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 414 / 415 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 344 / 343 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 8
Digit product: 16
Digital root: 8
Palindrome: No
Bit width: 9 bits
Reversed: 224
Recamán's sequence: a(472) = 422
Square (n²): 178,084
Cube (n³): 75,151,448
Divisor count: 4
σ(n) — sum of divisors: 636
φ(n) — Euler's totient: 210
Sum of prime factors: 213

Primality

Prime factorization: 2 × 211

Nearest primes: 421 (−1) · 431 (+9)

Divisors & multiples

All divisors (4)

1 · 2 · 211 (half) · 422

Aliquot sum (sum of proper divisors): 214

Factor pairs (a × b = 422)

1 × 422

2 × 211

First multiples

422 · 844 (double) · 1,266 · 1,688 · 2,110 · 2,532 · 2,954 · 3,376 · 3,798 · 4,220

Sums & aliquot sequence

As consecutive integers: 104 + 105 + 106 + 107

Aliquot sequence: 422 → 214 → 110 → 106 → 56 → 64 → 63 → 41 → 1 → 0 — terminates at zero

Representations

In words: four hundred twenty-two
Ordinal: 422nd
Roman numeral: CDXXII
Binary: 110100110
Octal: 646
Hexadecimal: 0x1A6
Base64: AaY=
One's complement: 65,113 (16-bit)

In other bases

ternary (3) 120122

quaternary (4) 12212

quinary (5) 3142

senary (6) 1542

septenary (7) 1142

nonary (9) 518

undecimal (11) 354

duodecimal (12) 2b2

tridecimal (13) 266

tetradecimal (14) 222

pentadecimal (15) 1d2

Historical numeral systems

Babylonian (base 60): 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺
Greek (Milesian): υκβʹ
Mayan (base 20): 𝋡·𝋡·𝋢
Chinese: 四百二十二
Chinese (financial): 肆佰貳拾貳

In other modern scripts

Eastern Arabic ٤٢٢ Devanagari ४२२ Bengali ৪২২ Tamil ௪௨௨ Thai ๔๒๒ Tibetan ༤༢༢ Khmer ៤២២ Lao ໔໒໒ Burmese ၄၂၂

Digit at this position in famous constants

π — Pi (π): Digit 422 = 0
e — Euler's number (e): Digit 422 = 4
φ — Golden ratio (φ): Digit 422 = 7
√2 — Pythagoras's (√2): Digit 422 = 0
ln 2 — Natural log of 2: Digit 422 = 9
γ — Euler-Mascheroni (γ): Digit 422 = 2

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 422, here are decompositions:

3 + 419 = 422
13 + 409 = 422
43 + 379 = 422
73 + 349 = 422
109 + 313 = 422
139 + 283 = 422
151 + 271 = 422
181 + 241 = 422

Showing the first eight; more decompositions exist.

Unicode codepoint

Latin Letter Yr

U+01A6

Uppercase letter (Lu)

UTF-8 encoding: C6 A6 (2 bytes).

Lookup U+01A6 on Compart ↗ Lookup on FileFormat.Info ↗

HTTP status code

HTTP 422 Unprocessable Entity — Request was well-formed but semantically invalid.

4xx class: Client Error.

Hex color

#0001A6

RGB(0, 1, 166)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.166.

Address: 0.0.1.166
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.1.166

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