1,812
1,812 is a composite number, even, a calendar year.
1,812 (one thousand eight hundred twelve) is an even 4-digit number. It is a composite number with 12 divisors, and factors as 2² × 3 × 151. Its proper divisors sum to 2,444, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is MDCCCXII and in binary, 11100010100.
Interestingness
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
Continued fraction of √n
√1,812 = [42; (1, 1, 3, 5, 28, 5, 3, 1, 1, 84)]
Period length 10 — the block in parentheses repeats forever.
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)
- Scientific notation
- 1.812 × 10³
- As a duration
- 1,812 s = 30 minutes, 12 seconds
As an angle
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.
Heard as a frequency, 1,812 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A♯6 (1864.7 Hz, -50¢ — about midway to A6)
- Scientific pitch (C4 = 256 Hz): A♯6 (1824.6 Hz, -12¢)
- Baroque pitch (A4 = 415 Hz): B6 (1863.3 Hz, -48¢ — about midway to A♯6)
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.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.