904
904 is a composite number, even, a calendar year.
904 (nine hundred four) is an even 3-digit number. It is a composite number with 8 divisors, and factors as 2³ × 113. Written other ways, in Roman numerals it is CMIV and in binary, 1110001000.
Interestingness
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
Primality
Prime factorization: 2 3 × 113
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√904 = [30; (15, 60)]
Period length 2 — the block in parentheses repeats forever.
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)
- Scientific notation
- 9.04 × 10²
- As a duration
- 904 s = 15 minutes, 4 seconds
As an angle
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
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'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.
UTF-8 encoding: CE 88 (2 bytes).
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.
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.
Heard as a frequency, 904 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A5 (880 Hz, +47¢ — about midway to A♯5)
- Scientific pitch (C4 = 256 Hz): A♯5 (912.3 Hz, -16¢)
- Baroque pitch (A4 = 415 Hz): A♯5 (879.4 Hz, +48¢ — about midway to B5)
On an ingredients label, E904 is Shellac, a glazing agent, gas or sweetener — a glaze secreted by the lac insect.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.