850
+850 is the international calling code for North Korea.
- Even
- Composite
Where 850 fits
Why 850 is special
North Korea's telephone network is largely isolated from the international system, and most domestic mobile phones cannot place or receive international calls at all.
Factors & digit properties
- Divisors (12)
- 1, 2, 5, 10, 17, 25, 34, 50, 85, 170, 425, 850
- Prime factorisation
- 2 × 5^2 × 17
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 850
- Binary
- 1101010010
- Octal
- 1522
- Hexadecimal
- 352
- Roman numeral
- DCCCL
- Scientific notation
- 8.500 × 10^2
Other mathematical patterns
- Deficient number
Related numbers & connections
North and South Korea have separate calling codes and separate networks. Most North Korean mobile subscribers cannot place international calls at all, regardless of the code.
View 82 →Other connections
- contrasts with82
why?
Strength 0.50, confidence "high".
Geography
+850 reaches North Korea, whose domestic mobile network is deliberately separated from the international one — most subscribers cannot dial abroad regardless of the code.
DocumentedGeographyGeography: North Korea
Common questions
Is 850 a prime number?
No, 850 is not prime.
What are the factors of 850?
The factors of 850 are 1, 2, 5, 10, 17, 25, 34, 50, 85, 170, 425, 850.
What is 850 in Roman numerals?
850 in Roman numerals is DCCCL.
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