1644
1644 is the year the Ming dynasty fell.
- Even
- Composite
Where 1644 fits
Why 1644 is special
Beijing was taken by rebels and then by the Manchus, who founded the Qing dynasty and ruled until 1912. A rebellion succeeded and its leader lost the resulting empire within weeks.
Factors & digit properties
- Divisors (12)
- 1, 2, 3, 4, 6, 12, 137, 274, 411, 548, 822, 1644
- Prime factorisation
- 2^2 × 3 × 137
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 1644
- Binary
- 11001101100
- Octal
- 3154
- Hexadecimal
- 66c
- Roman numeral
- MDCXLIV
- Scientific notation
- 1.644 × 10^3
Other mathematical patterns
- Abundant number
Related numbers & connections
The Zhou dynasty from around 1046 BC introduced the Mandate of Heaven, and every subsequent dynastic overthrow invoked it — including the Ming collapse in 1644.
View 1046 →Other connections
- is associated with1046
why?
Strength 0.50, confidence "high".
History
Li Zicheng's rebellion took Beijing in 1644 and the last Ming emperor killed himself. The Manchus then entered through a pass opened by a Ming general and kept the empire for 268 years.
DocumentedHistoryGeography: ChinaPeriod: 1644
Common questions
Is 1644 a prime number?
No, 1644 is not prime.
What are the factors of 1644?
The factors of 1644 are 1, 2, 3, 4, 6, 12, 137, 274, 411, 548, 822, 1644.
What is 1644 in Roman numerals?
1644 in Roman numerals is MDCXLIV.
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