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.
Same number, different meanings
How 1849 is understood across different contexts — never implying one meaning because of another.
- Mathematics
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.
- History
In 1849, the California Gold Rush drew about 300,000 people west, transforming the territory into a state within a year (United States).
- 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.
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
- Scientific notation
- 1.849 × 10^3
Roman numerals
M D C C C X L I X
MDCCCXLIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 1 1 0 0 1 1 1 0 0 1
1 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,849
Octal
3 4 7 1
3 × 512 + 4 × 64 + 7 × 8 + 1 × 1 = 1,849
Hexadecimal
7 3 9
7 × 256 + 3 × 16 + 9 × 1 = 1,849
Read as powers of two: 1,024 + 512 + 256 + 32 + 16 + 8 + 1 = 1,849.
In historical numeral systems
Egyptian
1 lotus, 8 coils of rope, 4 hobbles, 9 strokes
1 × 1,000 + 8 × 100 + 4 × 10 + 9 × 1 = 1,849. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges (sixties place), 4 corner wedges + 9 vertical wedges (units place)
30 × 60 + 49 = 1849. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Powerful number
- Semiprime
Related numbers & connections
1849 is a year in the 19th century, in the 1840s.
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 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- is associated with1810
why?
Strength 0.50, confidence "high".
History
In 1849, the California Gold Rush drew about 300,000 people west, transforming the territory into a state within a year (United States).
DocumentedHistoryGeography: United StatesPeriod: 1849
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. IX is subtractive: one before ten — ten minus one. Written additively it would be MDCCCXXXXVIIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026