1,812
1,812 is a composite number, even, a calendar year.
Notable events — 1812 AD
- Jun 18 The US declares war on Britain, beginning the War of 1812.
- Jun 24 Napoleon invades Russia with his Grande Armée.
- Sep 7 The Battle of Borodino is fought outside Moscow.
- Sep 14 Napoleon enters Moscow; the city burns the next day.
- Dec 14 Napoleon's catastrophic retreat from Russia all but ends his Grande Armée.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Wednesday
January 1, 1812
- Ended on
-
Thursday
December 31, 1812
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Easter Sunday
-
March 29
Sunday, March 29, 1812
- Decade
-
1810s
1810–1819
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
214
214 years before 2026.
- US presidential election
-
Yes
US holds a presidential election in years divisible by 4 starting from 1788.
In other calendars
- Hebrew
-
5572 / 5573 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1226 / 1227 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Monkey
Sexagenary cycle position 9 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2355 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1190 / 1191 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1804 / 1805 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1734 / 1733 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 12
- Digit product
- 16
- Digital root
- 3
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 2,181
- Recamán's sequence
- a(16,075) = 1,812
- Square (n²)
- 3,283,344
- Cube (n³)
- 5,949,419,328
- Divisor count
- 12
- σ(n) — sum of divisors
- 4,256
- φ(n) — Euler's totient
- 600
- Sum of prime factors
- 158
Primality
Prime factorization: 2 2 × 3 × 151
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred twelve
- Ordinal
- 1812th
- Roman numeral
- MDCCCXII
- Binary
- 11100010100
- Octal
- 3424
- Hexadecimal
- 0x714
- Base64
- BxQ=
- One's complement
- 63,723 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋 𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺
- Greek (Milesian)
- ͵αωιβʹ
- Mayan (base 20)
- 𝋤·𝋪·𝋬
- Chinese
- 一千八百一十二
- Chinese (financial)
- 壹仟捌佰壹拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,812 = 8
- e — Euler's number (e)
- Digit 1,812 = 1
- φ — Golden ratio (φ)
- Digit 1,812 = 5
- √2 — Pythagoras's (√2)
- Digit 1,812 = 6
- ln 2 — Natural log of 2
- Digit 1,812 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,812 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1812, here are decompositions:
- 11 + 1801 = 1812
- 23 + 1789 = 1812
- 29 + 1783 = 1812
- 53 + 1759 = 1812
- 59 + 1753 = 1812
- 71 + 1741 = 1812
- 79 + 1733 = 1812
- 89 + 1723 = 1812
Showing the first eight; more decompositions exist.
UTF-8 encoding: DC 94 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.20.
- Address
- 0.0.7.20
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.20
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1812 first appears in π at position 26,009 of the decimal expansion (the 26,009ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.