490
490 BC is the year of the Battle of Marathon.
- Even
- Composite
Where 490 fits
Why 490 is special
An Athenian force defeated a much larger Persian army. The modern marathon distance commemorates a messenger's run that Herodotus, writing closest to the events, does not mention.
490 is part of
Factors & digit properties
- Divisors (12)
- 1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490
- Prime factorisation
- 2 × 5 × 7^2
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 490
- Binary
- 111101010
- Octal
- 752
- Hexadecimal
- 1ea
- Roman numeral
- CDXC
- Scientific notation
- 4.900 × 10^2
Other mathematical patterns
- Abundant number
- Happy number
Related numbers & connections
Marathon in 490 BC and Thermopylae and Salamis ten years later are the two Persian invasions of Greece. The first was repelled by Athens alone and the second required a Greek coalition.
View 480 →Numbers Around Us
- appears alongside480
why?
Strength 0.50, confidence "high".
History
Marathon in 490 BC is real; the runner who died delivering news of it appears only in accounts written centuries later. Herodotus describes a different and much longer run, by a professional courier who survived.
DocumentedHistoryGeography: GreecePeriod: 490 BC
Common questions
Is 490 a prime number?
No, 490 is not prime.
What are the factors of 490?
The factors of 490 are 1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490.
What is 490 in Roman numerals?
490 in Roman numerals is CDXC.
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