Number

904

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

Deficient Number Evil Number Happy Number Recamán's Sequence Year

Historical context — 904 AD

Calendar year

Year 904 (CMIV) was a leap year starting on Sunday of the Julian calendar.

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Historical context — 904 BC

Decade

The 900s BC is a decade that lasted from 909 BC to 900 BC.

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Year facts

Year type: Leap year
Divisible by 4 and not by 100; February has 29 days.
Days in year: 366
ISO weeks: 52
Started on: Tuesday
January 1, 904
Ended on: Wednesday
December 31, 904
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 900s
900–909
Century: 10th century
901–1000
Millennium: 1st millennium
1–1000
Years ago: 1,122
1122 years before 2026.

In other calendars

Hebrew: 4664 / 4665 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 291 / 292 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Wood zodiac:Rat
Sexagenary cycle position 1 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1447 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 282 / 283 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 896 / 897 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 826 / 825 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 13
Digit product: 0
Digital root: 4
Palindrome: No
Bit width: 10 bits
Reversed: 409
Recamán's sequence: a(439) = 904
Square (n²): 817,216
Cube (n³): 738,763,264
Divisor count: 8
σ(n) — sum of divisors: 1,710
φ(n) — Euler's totient: 448
Sum of prime factors: 119

Primality

Prime factorization: 2 ³ × 113

Nearest primes: 887 (−17) · 907 (+3)

Divisors & multiples

All divisors (8)

1 · 2 · 4 · 8 · 113 · 226 · 452 (half) · 904

Aliquot sum (sum of proper divisors): 806

Factor pairs (a × b = 904)

1 × 904

2 × 452

4 × 226

8 × 113

First multiples

904 · 1,808 (double) · 2,712 · 3,616 · 4,520 · 5,424 · 6,328 · 7,232 · 8,136 · 9,040

Sums & aliquot sequence

As a sum of two squares: 2² + 30²

As consecutive integers: 49 + 50 + … + 64

Aliquot sequence: 904 → 806 → 538 → 272 → 286 → 218 → 112 → 136 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: nine hundred four
Ordinal: 904th
Roman numeral: CMIV
Binary: 1110001000
Octal: 1610
Hexadecimal: 0x388
Base64: A4g=
One's complement: 64,631 (16-bit)

In other bases

ternary (3) 1020111

quaternary (4) 32020

quinary (5) 12104

senary (6) 4104

septenary (7) 2431

nonary (9) 1214

undecimal (11) 752

duodecimal (12) 634

tridecimal (13) 547

tetradecimal (14) 488

pentadecimal (15) 404

Historical numeral systems

Babylonian (base 60): 𒌋𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺
Greek (Milesian): ϡδʹ
Mayan (base 20): 𝋢·𝋥·𝋤
Chinese: 九百零四
Chinese (financial): 玖佰零肆

In other modern scripts

Eastern Arabic ٩٠٤ Devanagari ९०४ Bengali ৯০৪ Tamil ௯௦௪ Thai ๙๐๔ Tibetan ༩༠༤ Khmer ៩០៤ Lao ໙໐໔ Burmese ၉၀၄

Digit at this position in famous constants

π — Pi (π): Digit 904 = 8
e — Euler's number (e): Digit 904 = 8
φ — Golden ratio (φ): Digit 904 = 7
√2 — Pythagoras's (√2): Digit 904 = 4
ln 2 — Natural log of 2: Digit 904 = 0
γ — Euler-Mascheroni (γ): Digit 904 = 0

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 904, here are decompositions:

17 + 887 = 904
23 + 881 = 904
41 + 863 = 904
47 + 857 = 904
83 + 821 = 904
107 + 797 = 904
131 + 773 = 904
227 + 677 = 904

Showing the first eight; more decompositions exist.

Unicode codepoint

Greek Capital Letter Epsilon With Tonos

U+0388

Uppercase letter (Lu)

UTF-8 encoding: CE 88 (2 bytes).

Lookup U+0388 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000388

RGB(0, 3, 136)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.136.

Address: 0.0.3.136
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.3.136

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

NANP area code 904

The number 904 is an active NANP area code (North American Numbering Plan).

Primary area: Jacksonville
Region: Florida
Country: United States

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 904 ↗