2006
2006 is the year Pluto was reclassified as a dwarf planet.
- Even
- Composite
Where 2006 fits
Why 2006 is special
The vote defined a planet as needing to have cleared its orbital neighbourhood, which Pluto has not. The decision was made by a fraction of the astronomers present on the final day of a conference and remains contested.
Factors & digit properties
- Divisors (8)
- 1, 2, 17, 34, 59, 118, 1003, 2006
- Prime factorisation
- 2 × 17 × 59
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 2006
- Binary
- 11111010110
- Octal
- 3726
- Hexadecimal
- 7d6
- Roman numeral
- MMVI
- Scientific notation
- 2.006 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
Pluto was reclassified in 2006 by a partial vote and the first black hole image was published in 2019 by a global collaboration. Both are cases of astronomy's conclusions resting on how its institutions work.
View 2019 →Science
The IAU's planet definition was adopted on the last day of its 2006 assembly by several hundred of the thousands of members. Objections have continued since, and the underlying issue — that Pluto is one of many similar bodies — is not in dispute even where the definition is.
DocumentedSciencePeriod: 2006
Common questions
Is 2006 a prime number?
No, 2006 is not prime.
What are the factors of 2006?
The factors of 2006 are 1, 2, 17, 34, 59, 118, 1003, 2006.
What is 2006 in Roman numerals?
2006 in Roman numerals is MMVI.
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