126
126 miles per hour is the world speed record for steam traction.
- Even
- Composite
Where 126 fits
Why 126 is special
Set by Mallard in 1938, it stands because the attempt damaged the locomotive and because no operator has since had reason to risk equipment for a record with no commercial value.
Factors & digit properties
- Divisors (12)
- 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126
- Prime factorisation
- 2 × 3^2 × 7
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 126
- Binary
- 1111110
- Octal
- 176
- Hexadecimal
- 7e
- Roman numeral
- CXXVI
- Scientific notation
- 1.260 × 10^2
Other mathematical patterns
- Abundant number
- Harshad (Niven) number
Related numbers & connections
Mallard reached 126 mph in 1938 and damaged a bearing doing it. The record has stood for nearly ninety years because breaking it would risk an irreplaceable machine for no commercial gain.
View 4468 →Other connections
- is associated with4468
why?
Strength 0.50, confidence "high".
Sport
The steam speed record of 126 mph has stood since 1938. Beating it would require risking an irreplaceable machine for no practical gain, which is why it is effectively permanent.
DocumentedSportGeography: United KingdomPeriod: 1938
Common questions
Is 126 a prime number?
No, 126 is not prime.
What are the factors of 126?
The factors of 126 are 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126.
What is 126 in Roman numerals?
126 in Roman numerals is CXXVI.
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