1863
1863 is the year the world's first underground railway opened, and the year of the Emancipation Proclamation.
- Odd
- Composite
Where 1863 fits
Why 1863 is special
The Metropolitan Railway ran steam locomotives through tunnels under London from January. Lincoln's proclamation took effect that same month and freed enslaved people only in states then in rebellion, which is why the Thirteenth Amendment was still needed.
Factors & digit properties
- Divisors (10)
- 1, 3, 9, 23, 27, 69, 81, 207, 621, 1863
- Prime factorisation
- 3^4 × 23
- Digit sum
- 18
- Digital root
- 9
Representations
- Decimal
- 1863
- Binary
- 11101000111
- Octal
- 3507
- Hexadecimal
- 747
- Roman numeral
- MDCCCLXIII
- Scientific notation
- 1.863 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
Britain abolished slavery in most of its empire in 1833 with compensation paid to owners; the Emancipation Proclamation of 1863 freed people only in states then in rebellion. Neither did what its popular summary claims.
View 1833 →Other connections
- contrasts with1833
why?
Strength 0.50, confidence "high".
Technology & computing
The Metropolitan Railway opened in January 1863, running steam locomotives underground beneath London — ventilation was a genuine and imperfectly solved problem. The Emancipation Proclamation took effect the same month and applied only to states then in rebellion.
DocumentedTechnology & computingPeriod: 1863
Common questions
Is 1863 a prime number?
No, 1863 is not prime.
What are the factors of 1863?
The factors of 1863 are 1, 3, 9, 23, 27, 69, 81, 207, 621, 1863.
What is 1863 in Roman numerals?
1863 in Roman numerals is MDCCCLXIII.
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