3800
The oldest well-dated rocks on Earth are about 3,800 million years old.
- Even
- Composite
Where 3800 fits
Why 3800 is special
Almost everything older has been subducted, melted or eroded, so the first 700 million years of Earth's history left almost no direct rock record.
Factors & digit properties
- Divisors (24)
- 1, 2, 4, 5, 8, 10, 19, 20, 25, 38, 40, 50, 76, 95, 100, 152, 190, 200, 380, 475, 760, 950, 1900, 3800
- Prime factorisation
- 2^3 × 5^2 × 19
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 3800
- Binary
- 111011011000
- Octal
- 7330
- Hexadecimal
- ed8
- Roman numeral
- MMMDCCC
- Scientific notation
- 3.800 × 10^3
Other mathematical patterns
- Abundant number
Related numbers & connections
One marks where the rock record begins and the other the only Precambrian period with a physical boundary marker.
View 635 →Science
Rocks of the Isua supracrustal belt in Greenland and comparable formations date to roughly 3.8 billion years. Older material survives mainly as detrital zircon grains rather than intact rock.
DocumentedScienceGeography: Greenland and Canada principallyPeriod: determined from the 1970s
Common questions
Is 3800 a prime number?
No, 3800 is not prime.
What are the factors of 3800?
The factors of 3800 are 1, 2, 4, 5, 8, 10, 19, 20, 25, 38, 40, 50, 76, 95, 100, 152, 190, 200, 380, 475, 760, 950, 1900, 3800.
What is 3800 in Roman numerals?
3800 in Roman numerals is MMMDCCC.
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