1779
1779 is the year the first cast-iron bridge was built.
- Odd
- Composite
Where 1779 fits
Why 1779 is special
The Iron Bridge at Coalbrookdale used iron where builders knew only timber and stone, so it was assembled with carpentry joints — dovetails and mortises cut into metal. It still stands.
Factors & digit properties
- Divisors (4)
- 1, 3, 593, 1779
- Prime factorisation
- 3 × 593
- Digit sum
- 24
- Digital root
- 6
Representations
- Decimal
- 1779
- Binary
- 11011110011
- Octal
- 3363
- Hexadecimal
- 6f3
- Roman numeral
- MDCCLXXIX
- Scientific notation
- 1.779 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Coke smelting from 1709 made iron cheap enough that the first cast-iron bridge could be built at Coalbrookdale in 1779, assembled with carpentry joints because nobody knew how else to join structural iron.
View 1709 →Other connections
- developed from1709
why?
Strength 0.50, confidence "high".
Technology & computing
The Iron Bridge's builders had no precedent for joining structural iron, so they used woodworking joints scaled up in metal. The result was heavier than necessary and has survived nearly 250 years.
DocumentedTechnology & computingGeography: EnglandPeriod: 1779
Common questions
Is 1779 a prime number?
No, 1779 is not prime.
What are the factors of 1779?
The factors of 1779 are 1, 3, 593, 1779.
What is 1779 in Roman numerals?
1779 in Roman numerals is MDCCLXXIX.
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