6397
NGC 6397 is one of the two closest globular clusters.
- Odd
- Prime
Where 6397 fits
Why 6397 is special
Its proximity lets telescopes resolve individual faint white dwarfs, which is how the cluster's age — and a lower bound on the galaxy's — has been measured.
6397 is part of
Factors & digit properties
- Divisors (2)
- 1, 6397
- Prime factorisation
- 6397
- Digit sum
- 25
- Digital root
- 7
Representations
- Decimal
- 6397
- Binary
- 1100011111101
- Octal
- 14375
- Hexadecimal
- 18fd
- Scientific notation
- 6.397 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
Both are unusually close globular clusters, which is what allows their individual faint stars to be resolved and dated.
View 5139 →Other connections
- is associated with5139
why?
Strength 0.50, confidence "high".
Science
NGC 6397 lies roughly 7,800 light years away. Observations reaching its faintest white dwarfs allow cooling-age estimates that constrain the age of the Galactic halo.
DocumentedSciencePeriod: 1751–
Common questions
Is 6397 a prime number?
Yes, 6397 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 6397?
The factors of 6397 are 1, 6397.
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