1930
1930 is the year Pluto was discovered.
- Even
- Composite
Where 1930 fits
Why 1930 is special
It was found by a 24-year-old comparing photographic plates for a tiny shifting dot. The prediction that led to the search was based on calculation errors, so Pluto was found in roughly the right place for entirely the wrong reasons.
1930 is part of
Factors & digit properties
- Divisors (8)
- 1, 2, 5, 10, 193, 386, 965, 1930
- Prime factorisation
- 2 × 5 × 193
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 1930
- Binary
- 11110001010
- Octal
- 3612
- Hexadecimal
- 78a
- Roman numeral
- MCMXXX
- Scientific notation
- 1.930 × 10^3
Other mathematical patterns
- Deficient number
- Happy number
Related numbers & connections
Ceres was found in 1801 and called a planet, then an asteroid, then a dwarf planet; Pluto was found in 1930 and reclassified in 2006. Neither object changed.
View 1801 →Science
The search that located Pluto was driven by supposed irregularities in Neptune's orbit that turned out not to exist. Clyde Tombaugh found a real object near the predicted position anyway, which makes the discovery genuine and the prediction spurious.
DocumentedSciencePeriod: 1930
Common questions
Is 1930 a prime number?
No, 1930 is not prime.
What are the factors of 1930?
The factors of 1930 are 1, 2, 5, 10, 193, 386, 965, 1930.
What is 1930 in Roman numerals?
1930 in Roman numerals is MCMXXX.
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