856
+856 is the international calling code for Laos.
- Even
- Composite
Where 856 fits
Why 856 is special
Laos is the only landlocked country in Southeast Asia and is the most heavily bombed country per capita in history.
Factors & digit properties
- Divisors (8)
- 1, 2, 4, 8, 107, 214, 428, 856
- Prime factorisation
- 2^3 × 107
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 856
- Scientific notation
- 8.560 × 10^2
Roman numerals
D C C C L V I
Binary
1 1 0 1 0 1 1 0 0 0
1 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 856
Octal
1 5 3 0
1 × 512 + 5 × 64 + 3 × 8 + 0 × 1 = 856
Hexadecimal
3 5 8
3 × 256 + 5 × 16 + 8 × 1 = 856
Read as powers of two: 512 + 256 + 64 + 16 + 8 = 856.
In historical numeral systems
Egyptian
8 coils of rope, 5 hobbles, 6 strokes
8 × 100 + 5 × 10 + 6 × 1 = 856. 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 + 6 vertical wedges (units place)
14 × 60 + 16 = 856. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
omega, then nu, then stigma, marked as a numeral
omega-nu-stigma + keraia
omega + nu + stigma 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, then vav
tav-tav-nun-vav
tav (400) + tav (400) + nun (50) + vav (6) = 856, 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
Cambodia and Laos are neighbours whose modern infrastructure was shaped by the same conflict. Laos is the most heavily bombed country per capita in history.
View 855 →Nearby in a sequence
- is adjacent to855
why?
Strength 0.50, confidence "high".
Geography
+856 reaches Laos, the only landlocked state in Southeast Asia. More ordnance was dropped on it between 1964 and 1973 than on Germany and Japan combined in the Second World War.
DocumentedGeographyGeography: Laos
Common questions
Is 856 a prime number?
No, 856 is not prime.
What are the factors of 856?
The factors of 856 are 1, 2, 4, 8, 107, 214, 428, 856.
What is 856 in Roman numerals?
856 in Roman numerals is DCCCLVI.
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: 15 July 2026