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
- Binary
- 11100010100
- Octal
- 3424
- Hexadecimal
- 714
- Roman numeral
- MDCCCXII
- Scientific notation
- 1.812 × 10^3
Other mathematical patterns
- Abundant number
- Happy number
- Harshad (Niven) number
Related numbers & connections
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
Around 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: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026