1846
1846 is the year Neptune was found where mathematics said it would be.
- Even
- Composite
Where 1846 fits
Why 1846 is special
Two mathematicians independently predicted its position from irregularities in Uranus's orbit. The telescope search took under an hour. The subsequent priority dispute between Britain and France was more prolonged than the search.
Factors & digit properties
- Divisors (8)
- 1, 2, 13, 26, 71, 142, 923, 1846
- Prime factorisation
- 2 × 13 × 71
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 1846
- Binary
- 11100110110
- Octal
- 3466
- Hexadecimal
- 736
- Roman numeral
- MDCCCXLVI
- Scientific notation
- 1.846 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
Neptune was found in 1846 and completed its first orbit since discovery in 2011, 165 years later.
View 60190 →Science
Le Verrier and Adams independently calculated where an unseen planet must be. Galle found Neptune within a degree of the prediction on the first night. Confirming a theory by pointing a telescope at a calculated spot is about as direct as scientific prediction gets.
DocumentedSciencePeriod: 1846
Common questions
Is 1846 a prime number?
No, 1846 is not prime.
What are the factors of 1846?
The factors of 1846 are 1, 2, 13, 26, 71, 142, 923, 1846.
What is 1846 in Roman numerals?
1846 in Roman numerals is MDCCCXLVI.
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