1686
1686 is the year the first recorded description of a fossil dinosaur bone was published.
- Even
- Composite
Where 1686 fits
Why 1686 is special
It was interpreted as the thigh bone of a giant human. The concept of extinct species did not exist, so the evidence was fitted to the framework available.
Factors & digit properties
- Divisors (8)
- 1, 2, 3, 6, 281, 562, 843, 1686
- Prime factorisation
- 2 × 3 × 281
- Digit sum
- 21
- Digital root
- 3
Representations
- Decimal
- 1686
- Binary
- 11010010110
- Octal
- 3226
- Hexadecimal
- 696
- Roman numeral
- MDCLXXXVI
- Scientific notation
- 1.686 × 10^3
Other mathematical patterns
- Abundant number
Related numbers & connections
A fossil bone described in 1686 was read as a giant human's because extinction was not a available concept. Buffon's natural history from 1749 proposed an Earth old enough for species to change.
View 1749 →Other connections
- contrasts with1749
why?
Strength 0.50, confidence "high".
Science
A bone described in 1686 is now recognised as dinosaur. Without a concept of extinction, the only available reading was a giant human, which is what was published.
DocumentedScienceGeography: EnglandPeriod: 1686
Common questions
Is 1686 a prime number?
No, 1686 is not prime.
What are the factors of 1686?
The factors of 1686 are 1, 2, 3, 6, 281, 562, 843, 1686.
What is 1686 in Roman numerals?
1686 in Roman numerals is MDCLXXXVI.
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