1865
1865 is the year the American Civil War ended and slavery was abolished in the United States.
- Odd
- Composite
Where 1865 fits
Why 1865 is special
Lee surrendered at Appomattox in April, Lincoln was assassinated five days later, and the Thirteenth Amendment was ratified in December. The compression of those events into one year is why 1865 rather than 1863 is the date that closes the period.
Factors & digit properties
- Divisors (4)
- 1, 5, 373, 1865
- Prime factorisation
- 5 × 373
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 1865
- Binary
- 11101001001
- Octal
- 3511
- Hexadecimal
- 749
- Roman numeral
- MDCCCLXV
- Scientific notation
- 1.865 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
The American Civil War ran from 1861 to 1865, and 1865 rather than the 1863 Emancipation Proclamation is the date that closes the period, because that is when the Thirteenth Amendment was ratified.
View 1861 →Other connections
- is associated with1861
why?
Strength 0.50, confidence "high".
History
Lee surrendered at Appomattox in April 1865, Lincoln was assassinated five days later, and the Thirteenth Amendment abolishing slavery was ratified in December. The compression of those into a single year is why 1865 rather than the 1863 Emancipation Proclamation is the date that closes the period.
DocumentedHistoryGeography: United StatesPeriod: 1865
Common questions
Is 1865 a prime number?
No, 1865 is not prime.
What are the factors of 1865?
The factors of 1865 are 1, 5, 373, 1865.
What is 1865 in Roman numerals?
1865 in Roman numerals is MDCCCLXV.
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