1849
1849 is the year the safety pin was patented.
Where 1849 fits
Why 1849 is special
Walter Hunt invented it in a few hours to settle a debt and sold the rights for four hundred dollars. The buyer made a fortune.
1849 is part of
Factors & digit properties
- Divisors (3)
- 1, 43, 1849
- Prime factorisation
- 43^2
- Digit sum
- 22
- Digital root
- 4
Representations
- Decimal
- 1849
- Binary
- 11100111001
- Octal
- 3471
- Hexadecimal
- 739
- Roman numeral
- MDCCCXLIX
- Scientific notation
- 1.849 × 10^3
Other mathematical patterns
- Deficient number
- Powerful number
- Semiprime
Related numbers & connections
Tin cans were patented in 1810 and a practical can opener appeared around 1858. The safety pin of 1849 sits between them as another small object solving a problem nobody had formalised.
View 1810 →Other connections
- is associated with1810
why?
Strength 0.50, confidence "high".
Everyday life
Walter Hunt designed the safety pin in an afternoon to clear a fifteen-dollar debt and sold the patent outright. It is a standard example of an inventor capturing almost none of an invention's value.
DocumentedEveryday life
Common questions
Is 1849 a prime number?
No, 1849 is not prime.
What are the factors of 1849?
The factors of 1849 are 1, 43, 1849.
What is 1849 in Roman numerals?
1849 in Roman numerals is MDCCCXLIX.
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