3987
RFC 3987 defines internationalised resource identifiers.
- Odd
- Composite
Where 3987 fits
Why 3987 is special
It allows non-ASCII characters directly in a URI-like identifier, with a defined mapping back to the ASCII form the network actually uses.
3987 is part of
Factors & digit properties
- Divisors (6)
- 1, 3, 9, 443, 1329, 3987
- Prime factorisation
- 3^2 × 443
- Digit sum
- 27
- Digital root
- 9
Representations
- Decimal
- 3987
- Scientific notation
- 3.987 × 10^3
Roman numerals
M M M C M L X X X V I I
MMMCMLXXXVII uses the subtractive pair CM: a hundred before a thousand — a thousand minus a hundred.
Binary
1 1 1 1 1 0 0 1 0 0 1 1
1 × 2,048 + 1 × 1,024 + 1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 3,987
Octal
7 6 2 3
7 × 512 + 6 × 64 + 2 × 8 + 3 × 1 = 3,987
Hexadecimal
f 9 3
f × 256 + 9 × 16 + 3 × 1 = 3,987
Read as powers of two: 2,048 + 1,024 + 512 + 256 + 128 + 16 + 2 + 1 = 3,987.
In historical numeral systems
Egyptian
3 lotuses, 9 coils of rope, 8 hobbles, 7 strokes
3 × 1,000 + 9 × 100 + 8 × 10 + 7 × 1 = 3,987. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
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
- Happy number
Related numbers & connections
IRIs extend URI syntax to the full character set with a defined mapping back to the ASCII form protocols use.
View 3986 →Technology & computing
RFC 3987 specifies IRIs, extending URI syntax to the Universal Character Set with a deterministic mapping to URIs for protocol use.
DocumentedTechnology & computingGeography: International — IETFPeriod: 2005
Common questions
Is 3987 a prime number?
No, 3987 is not prime.
What are the factors of 3987?
The factors of 3987 are 1, 3, 9, 443, 1329, 3987.
What is 3987 in Roman numerals?
3987 in Roman numerals is MMMCMLXXXVII. CM is subtractive: a hundred before a thousand — a thousand minus a hundred. Written additively it would be MMMDCCCCLXXXVII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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