1215
1215 is the year King John sealed Magna Carta at Runnymede.
- Odd
- Composite
Where 1215 fits
Why 1215 is special
1215 is invoked far more often than it is read. Magna Carta was a peace treaty between a king and rebellious barons, annulled by the Pope within ten weeks, and most of its clauses concerned feudal dues. Three remain on the English statute book, including the one guaranteeing lawful judgment before imprisonment.
1215 is part of
Factors & digit properties
- Divisors (12)
- 1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215
- Prime factorisation
- 3^5 × 5
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 1215
- Binary
- 10010111111
- Octal
- 2277
- Hexadecimal
- 4bf
- Roman numeral
- MCCXV
- Scientific notation
- 1.215 × 10^3
Other mathematical patterns
- Deficient number
- Happy number
- Harshad (Niven) number
Related numbers & connections
Becket was murdered in 1170 and Magna Carta sealed in 1215. Both are episodes in the same argument about whether a king is subject to any authority.
View 1170 →Law & regulation
Magna Carta was annulled by Pope Innocent III within ten weeks and most of its 63 clauses dealt with feudal grievances now meaningless. Three remain law in England, including the guarantee of lawful judgment before imprisonment — which is the clause everything else invoked about it rests on.
DocumentedLaw & regulationGeography: England
Common questions
Is 1215 a prime number?
No, 1215 is not prime.
What are the factors of 1215?
The factors of 1215 are 1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215.
What is 1215 in Roman numerals?
1215 in Roman numerals is MCCXV.
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