239
+239 is the international calling code for São Tomé and Príncipe.
- Odd
- Prime
Where 239 fits
Why 239 is special
São Tomé is one of the smallest African states by population and sits almost exactly on the equator and the prime meridian.
Same number, different meanings
How 239 is understood across different contexts — never implying one meaning because of another.
- Mathematics
São Tomé is one of the smallest African states by population and sits almost exactly on the equator and the prime meridian.
- Science
Plutonium-239 is produced by neutron capture in uranium-238 rather than mined. Its 24,100-year half-life and fissile properties make reactor-grade separation a proliferation concern.
- Geography
+239 reaches São Tomé and Príncipe, whose territory lies close to the intersection of the equator and the prime meridian — the nominal zero point of the coordinate system.
239 is part of
Factors & digit properties
- Divisors (2)
- 1, 239
- Prime factorisation
- 239
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 239
- Binary
- 11101111
- Octal
- 357
- Hexadecimal
- ef
- Roman numeral
- CCXXXIX
- Scientific notation
- 2.390 × 10^2
Other mathematical patterns
- Deficient number
- Happy number
- Sophie Germain prime
- Twin prime
Related numbers & connections
Cape Verde and São Tomé and Príncipe are both Atlantic archipelagos that were uninhabited before Portuguese settlement, so their creole cultures formed entirely from that encounter.
View 238 →Other connections
- is associated with238
why?
Strength 0.50, confidence "high".
Science
Plutonium-239 is produced by neutron capture in uranium-238 rather than mined. Its 24,100-year half-life and fissile properties make reactor-grade separation a proliferation concern.
DocumentedScienceGeography: GlobalPeriod: 1941–
Geography
+239 reaches São Tomé and Príncipe, whose territory lies close to the intersection of the equator and the prime meridian — the nominal zero point of the coordinate system.
DocumentedGeographyGeography: São Tomé and Príncipe
Common questions
Is 239 a prime number?
Yes, 239 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 239?
The factors of 239 are 1, 239.
What is 239 in Roman numerals?
239 in Roman numerals is CCXXXIX.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 3 August 2026