1279
1279 is the year the Song dynasty fell to the Mongols.
- Odd
- Prime
Where 1279 fits
Why 1279 is special
China was ruled by a foreign dynasty for the first time in its entirety. Song China had had paper money, gunpowder weapons and printing, and much of that technical lead was transmitted westward under Mongol rule.
1279 is part of
Factors & digit properties
- Divisors (2)
- 1, 1279
- Prime factorisation
- 1279
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 1279
- Binary
- 10011111111
- Octal
- 2377
- Hexadecimal
- 4ff
- Roman numeral
- MCCLXXIX
- Scientific notation
- 1.279 × 10^3
Other mathematical patterns
- Deficient number
- Twin prime
Related numbers & connections
The Song fell to the Mongols in 1279 and the Ming expelled them in 1368, restoring native rule after eighty-nine years.
View 1368 →History
Song China had movable type, paper currency and gunpowder before its conquest in 1279. Mongol control of the overland routes is a substantial part of how those technologies reached Europe.
DocumentedHistoryGeography: ChinaPeriod: 1279
Common questions
Is 1279 a prime number?
Yes, 1279 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1279?
The factors of 1279 are 1, 1279.
What is 1279 in Roman numerals?
1279 in Roman numerals is MCCLXXIX.
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