Number

825

825 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Evil Number Harshad / Niven Recamán's Sequence Smith Number Year

Historical context — 825 AD

Calendar year

Year 825 (DCCCXXV) was a common year starting on Sunday of the Julian calendar.

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Historical context — 825 BC

Decade

This article concerns the period 829 BC – 820 BC.

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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: Wednesday
January 1, 825
Ended on: Wednesday
December 31, 825
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 820s
820–829
Century: 9th century
801–900
Millennium: 1st millennium
1–1000
Years ago: 1,201
1201 years before 2026.

In other calendars

Hebrew: 4585 / 4586 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 209 / 210 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Wood zodiac:Snake
Sexagenary cycle position 42 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1368 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 203 / 204 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 817 / 818 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 747 / 746 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 15
Digit product: 80
Digital root: 6
Palindrome: No
Bit width: 10 bits
Reversed: 528
Recamán's sequence: a(2,098) = 825
Square (n²): 680,625
Cube (n³): 561,515,625
Divisor count: 12
σ(n) — sum of divisors: 1,488
φ(n) — Euler's totient: 400
Sum of prime factors: 24

Primality

Prime factorization: 3 × 5 ² × 11

Nearest primes: 823 (−2) · 827 (+2)

Divisors & multiples

All divisors (12)

1 · 3 · 5 · 11 · 15 · 25 · 33 · 55 · 75 · 165 · 275 · 825

Aliquot sum (sum of proper divisors): 663

Factor pairs (a × b = 825)

1 × 825

3 × 275

5 × 165

11 × 75

15 × 55

25 × 33

First multiples

825 · 1,650 (double) · 2,475 · 3,300 · 4,125 · 4,950 · 5,775 · 6,600 · 7,425 · 8,250

Sums & aliquot sequence

As consecutive integers: 412 + 413 274 + 275 + 276 163 + 164 + 165 + 166 + 167 135 + 136 + 137 + 138 + 139 + 140

Aliquot sequence: 825 → 663 → 345 → 231 → 153 → 81 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: eight hundred twenty-five
Ordinal: 825th
Roman numeral: DCCCXXV
Binary: 1100111001
Octal: 1471
Hexadecimal: 0x339
Base64: Azk=
One's complement: 64,710 (16-bit)

In other bases

ternary (3) 1010120

quaternary (4) 30321

quinary (5) 11300

senary (6) 3453

septenary (7) 2256

nonary (9) 1116

undecimal (11) 690

duodecimal (12) 589

tridecimal (13) 4b6

tetradecimal (14) 42d

pentadecimal (15) 3a0

Historical numeral systems

Babylonian (base 60): 𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ωκεʹ
Mayan (base 20): 𝋢·𝋡·𝋥
Chinese: 八百二十五
Chinese (financial): 捌佰貳拾伍

In other modern scripts

Eastern Arabic ٨٢٥ Devanagari ८२५ Bengali ৮২৫ Tamil ௮௨௫ Thai ๘๒๕ Tibetan ༨༢༥ Khmer ៨២៥ Lao ໘໒໕ Burmese ၈၂၅

Digit at this position in famous constants

π — Pi (π): Digit 825 = 2
e — Euler's number (e): Digit 825 = 2
φ — Golden ratio (φ): Digit 825 = 2
√2 — Pythagoras's (√2): Digit 825 = 7
ln 2 — Natural log of 2: Digit 825 = 0
γ — Euler-Mascheroni (γ): Digit 825 = 4

Also seen as

Unicode codepoint

Combining Right Half Ring Below

U+0339

Non-spacing mark (Mn)

UTF-8 encoding: CC B9 (2 bytes).

Lookup U+0339 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000339

RGB(0, 3, 57)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.57.

Address: 0.0.3.57
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.3.57

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

NANP area code 825

The number 825 is an active NANP area code (North American Numbering Plan).

Primary area: Statewide
Region: Alberta
Country: Canada

Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.

Look up area code 825 ↗