812
812 is a composite number, even, a calendar year.
Historical context — 812 AD
Calendar year
Year 812 (DCCCXII) was a leap year starting on Thursday of the Julian calendar, the 812th year of the Common Era (CE) and Anno Domini (AD) designations, the 812th year of the 1st millennium, the 12th year of the 9th century, and the 3rd year of the 810s decade.
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Historical context — 812 BC
Decade
This article concerns the period 819 BC – 810 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
-
Sunday
January 1, 812
- Ended on
-
Monday
December 31, 812
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
810s
810–819
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,214
1214 years before 2026.
In other calendars
- Hebrew
-
4572 / 4573 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
196 / 197 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Dragon
Sexagenary cycle position 29 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1355 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
190 / 191 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
804 / 805 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
734 / 733 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 2 × 7 × 29
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- eight hundred twelve
- Ordinal
- 812th
- Roman numeral
- DCCCXII
- Binary
- 1100101100
- Octal
- 1454
- Hexadecimal
- 0x32C
- Base64
- Ayw=
- One's complement
- 64,723 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺
- Greek (Milesian)
- ωιβʹ
- Mayan (base 20)
- 𝋢·𝋠·𝋬
- Chinese
- 八百一十二
- Chinese (financial)
- 捌佰壹拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 812 = 3
- e — Euler's number (e)
- Digit 812 = 6
- φ — Golden ratio (φ)
- Digit 812 = 7
- √2 — Pythagoras's (√2)
- Digit 812 = 5
- ln 2 — Natural log of 2
- Digit 812 = 1
- γ — Euler-Mascheroni (γ)
- Digit 812 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 812, here are decompositions:
- 3 + 809 = 812
- 43 + 769 = 812
- 61 + 751 = 812
- 73 + 739 = 812
- 79 + 733 = 812
- 103 + 709 = 812
- 139 + 673 = 812
- 151 + 661 = 812
Showing the first eight; more decompositions exist.
UTF-8 encoding: CC AC (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.44.
- Address
- 0.0.3.44
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.44
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 812 is an active NANP area code (North American Numbering Plan).
- Primary area
- Evansville / Bloomington
- Region
- Indiana
- 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.