1812
1812 is the year Napoleon invaded Russia.
- Even
- Composite
Where 1812 fits
Why 1812 is special
Around 600,000 troops went in and a small fraction came out, destroyed by distance, winter and a retreat through territory already stripped. Minard's 1869 chart of the campaign's shrinking army is still cited as the best statistical graphic ever drawn.
1812 is part of
Factors & digit properties
- Divisors (12)
- 1, 2, 3, 4, 6, 12, 151, 302, 453, 604, 906, 1812
- Prime factorisation
- 2^2 × 3 × 151
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 1812
- Scientific notation
- 1.812 × 10^3
Roman numerals
M D C C C X I I
Binary
1 1 1 0 0 0 1 0 1 0 0
1 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 1,812
Octal
3 4 2 4
3 × 512 + 4 × 64 + 2 × 8 + 4 × 1 = 1,812
Hexadecimal
7 1 4
7 × 256 + 1 × 16 + 4 × 1 = 1,812
Read as powers of two: 1,024 + 512 + 256 + 16 + 4 = 1,812.
In historical numeral systems
Egyptian
1 lotus, 8 coils of rope, 1 hobble, 2 strokes
1 × 1,000 + 8 × 100 + 1 × 10 + 2 × 1 = 1,812. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges (sixties place), 1 corner wedge + 2 vertical wedges (units place)
30 × 60 + 12 = 1812. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Abundant number
- Happy number
- Harshad (Niven) number
Related numbers & connections
1812 is a year in the 19th century, in the 1810s.
Trafalgar in 1805 ended the invasion threat to Britain and the Russian campaign of 1812 destroyed Napoleon's army. Neither was the final defeat and both were decisive.
View 1805 →History
In 1812, Napoleon's invasion of Russia ended in the destruction of the Grande Armée during the winter retreat (Russia).
DocumentedHistoryGeography: RussiaPeriod: 1812Around 600,000 troops entered Russia and a small fraction returned. Minard's 1869 diagram of the campaign — army size, direction, geography and temperature in one image — is still widely cited as the finest statistical graphic ever produced.
DocumentedHistoryGeography: Russia and FrancePeriod: 1812
Common questions
Is 1812 a prime number?
No, 1812 is not prime.
What are the factors of 1812?
The factors of 1812 are 1, 2, 3, 4, 6, 12, 151, 302, 453, 604, 906, 1812.
What is 1812 in Roman numerals?
1812 in Roman numerals is MDCCCXII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026