1909
1909 is the year Haber demonstrated ammonia synthesis from air.
- Odd
- Composite
Where 1909 fits
Why 1909 is special
Industrial nitrogen fixation feeds a large share of the world's population — by common estimates around half the nitrogen in a human body has passed through the process. The same chemistry supplied explosives and Haber also directed chemical weapons development.
Factors & digit properties
- Divisors (4)
- 1, 23, 83, 1909
- Prime factorisation
- 23 × 83
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 1909
- Binary
- 11101110101
- Octal
- 3565
- Hexadecimal
- 775
- Roman numeral
- MCMIX
- Scientific notation
- 1.909 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Haber demonstrated ammonia synthesis in 1909, feeding a large share of the world's population, and directed chemical weapons development during the war that ended in 1918.
View 1918 →Science
Haber-Bosch synthesis takes nitrogen from the air and makes fertiliser, sustaining a substantial share of the world's population. Haber also personally directed Germany's chemical weapons programme. Both facts belong to the same person and the same chemistry.
DocumentedSciencePeriod: 1909
Common questions
Is 1909 a prime number?
No, 1909 is not prime.
What are the factors of 1909?
The factors of 1909 are 1, 23, 83, 1909.
What is 1909 in Roman numerals?
1909 in Roman numerals is MCMIX.
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