384,400
The Moon is about 384,400 km from Earth on average.
Where 384,400 fits
Why 384,400 is special
The distance is known to within centimetres because Apollo and Soviet missions left retroreflectors on the surface that lasers are still bounced off today. Those measurements show the Moon receding by about 3.8 cm a year.
384,400 is part of
Factors & digit properties
- Divisors (45)
- 1, 2, 4, 5, 8, 10, 16, 20, 25, 31, 40, 50, 62, 80, 100, 124, 155, 200, 248, 310, 400, 496, 620, 775, 961, 1240, 1550, 1922, 2480, 3100, 3844, 4805, 6200, 7688, 9610, 12400, 15376, 19220, 24025, 38440, 48050, 76880, 96100, 192200, 384400
- Prime factorisation
- 2^4 × 5^2 × 31^2
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 384400
- Binary
- 1011101110110010000
- Octal
- 1356620
- Hexadecimal
- 5dd90
- Scientific notation
- 3.844 × 10^5
Other mathematical patterns
- Abundant number
- Powerful number
Related numbers & connections
The Sun's diameter is over three times the Earth–Moon distance, so the entire lunar orbit would fit inside the Sun with room to spare.
View 1392700 →The Sun is about 390 times further away than the Moon and about 400 times wider, which is why the two appear almost the same size and why total eclipses work.
View 150 →Science
The Moon's average distance is about 384,400 km, known precisely because Apollo and Soviet missions left retroreflectors that lasers are still bounced off. Those measurements show the Moon receding by roughly 3.8 cm each year.
DocumentedScience
Common questions
Is 384,400 a prime number?
No, 384,400 is not prime.
What are the factors of 384,400?
The factors of 384,400 are 1, 2, 4, 5, 8, 10, 16, 20, 25, 31, 40, 50, 62, 80, 100, 124, 155, 200, 248, 310, 400, 496, 620, 775, 961, 1240, 1550, 1922, 2480, 3100, 3844, 4805, 6200, 7688, 9610, 12400, 15376, 19220, 24025, 38440, 48050, 76880, 96100, 192200, 384400.
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