290
+290 is the international calling code for Saint Helena.
- Even
- Composite
Where 290 fits
Why 290 is special
Saint Helena is among the most remote inhabited islands on Earth and had no airport until 2016, relying on a Royal Mail ship for all access.
Factors & digit properties
- Divisors (8)
- 1, 2, 5, 10, 29, 58, 145, 290
- Prime factorisation
- 2 × 5 × 29
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 290
- Binary
- 100100010
- Octal
- 442
- Hexadecimal
- 122
- Roman numeral
- CCXC
- Scientific notation
- 2.900 × 10^2
Other mathematical patterns
- Deficient number
Related numbers & connections
Ascension and Saint Helena are administered together and are among the remotest inhabited places on Earth. Saint Helena had no airport until 2016.
View 247 →Other connections
- is associated with247
why?
Strength 0.50, confidence "high".
Geography
+290 reaches Saint Helena, which depended on a scheduled ship for every arrival and departure until an airport opened in 2016 — delayed because wind shear made the first runway unusable.
DocumentedGeographyGeography: Saint Helena
Common questions
Is 290 a prime number?
No, 290 is not prime.
What are the factors of 290?
The factors of 290 are 1, 2, 5, 10, 29, 58, 145, 290.
What is 290 in Roman numerals?
290 in Roman numerals is CCXC.
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