856
856 is a composite number, even, a calendar year.
856 (eight hundred fifty-six) is an even 3-digit number. It is a composite number with 8 divisors, and factors as 2³ × 107. Written other ways, in Roman numerals it is DCCCLVI and in binary, 1101011000.
Interestingness
Historical context — 856 AD
Calendar year
Year 856 (DCCCLVI) was a leap year starting on Wednesday of the Julian calendar.
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Historical context — 856 BC
Decade
This article concerns the period 859 BC – 850 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
-
Saturday
January 1, 856
- Ended on
-
Sunday
December 31, 856
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
850s
850–859
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,170
1170 years before 2026.
In other calendars
- Hebrew
-
4616 / 4617 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
241 / 242 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Fire zodiac:Rat
Sexagenary cycle position 13 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1399 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
234 / 235 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
848 / 849 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
778 / 777 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 3 × 107
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√856 = [29; (3, 1, 7, 1, 1, 1, 1, 4, 3, 1, 2, 6, 7, 6, 2, 1, 3, 4, 1, 1, 1, 1, 7, 1, …)]
Period length 26 — the block in parentheses repeats forever.
Representations
- In words
- eight hundred fifty-six
- Ordinal
- 856th
- Roman numeral
- DCCCLVI
- Binary
- 1101011000
- Octal
- 1530
- Hexadecimal
- 0x358
- Base64
- A1g=
- One's complement
- 64,679 (16-bit)
- Scientific notation
- 8.56 × 10²
- As a duration
- 856 s = 14 minutes, 16 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ωνϛʹ
- Mayan (base 20)
- 𝋢·𝋢·𝋰
- Chinese
- 八百五十六
- Chinese (financial)
- 捌佰伍拾陸
Digit at this position in famous constants
- π — Pi (π)
- Digit 856 = 0
- e — Euler's number (e)
- Digit 856 = 6
- φ — Golden ratio (φ)
- Digit 856 = 2
- √2 — Pythagoras's (√2)
- Digit 856 = 2
- ln 2 — Natural log of 2
- Digit 856 = 8
- γ — Euler-Mascheroni (γ)
- Digit 856 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 856, here are decompositions:
- 3 + 853 = 856
- 17 + 839 = 856
- 29 + 827 = 856
- 47 + 809 = 856
- 59 + 797 = 856
- 83 + 773 = 856
- 113 + 743 = 856
- 137 + 719 = 856
Showing the first eight; more decompositions exist.
UTF-8 encoding: CD 98 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.88.
- Address
- 0.0.3.88
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.88
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 856 is an active NANP area code (North American Numbering Plan).
- Primary area
- Camden / Vineland
- Region
- New Jersey
- 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, 856 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A5 (880 Hz, -48¢ — about midway to G♯5)
- Scientific pitch (C4 = 256 Hz): A5 (861.1 Hz, -10¢)
- Baroque pitch (A4 = 415 Hz): A♯5 (879.4 Hz, -47¢ — about midway to A5)
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.