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.
850 connects to:
- numbers in transport — appears in
- 82 — contrasts with
Same number, different meanings
How 850 is understood across different contexts — never implying one meaning because of another.
- Mathematics
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.
- Technology & computing
There are about 850 million shipping containers moved through ports each year, counted in twenty-foot equivalents. Figure as of 2023. A single box is counted again at every port it passes through, so the figure measures handling rather than cargo — one container on a two-stop route contributes twice.
- 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.
850 is part of
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
- Scientific notation
- 8.500 × 10^2
Roman numerals
D C C C L
Binary
1 1 0 1 0 1 0 0 1 0
1 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 0 × 1 = 850
Octal
1 5 2 2
1 × 512 + 5 × 64 + 2 × 8 + 2 × 1 = 850
Hexadecimal
3 5 2
3 × 256 + 5 × 16 + 2 × 1 = 850
Read as powers of two: 512 + 256 + 64 + 16 + 2 = 850.
In historical numeral systems
Egyptian
8 coils of rope, 5 hobbles
8 × 100 + 5 × 10 = 850. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 4 vertical wedges (sixties place), 1 corner wedge (units place)
14 × 60 + 10 = 850. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
omega, then nu, marked as a numeral
omega-nu + keraia
omega + nu written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then tav, then nun
tav-tav-nun
tav (400) + tav (400) + nun (50) = 850, written in descending order.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
Related numbers & connections
850 appears in Numbers in transport, the topic covering numbers that carry a documented transport fact.
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 →Numbers Around Us
- appears inTransport
why?
Strength 0.50, confidence "high".
Other connections
- contrasts with82
why?
Strength 0.50, confidence "high".
Technology & computing
There are about 850 million shipping containers moved through ports each year, counted in twenty-foot equivalents. Figure as of 2023. A single box is counted again at every port it passes through, so the figure measures handling rather than cargo — one container on a two-stop route contributes twice.
DocumentedTechnology & computingGeography: worldwide
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: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026