3864
ISO 3864 defines the colours and shapes of safety signs.
- Even
- Composite
Where 3864 fits
Why 3864 is special
Red means prohibition, yellow warning and blue mandatory action, and those meanings are fixed before any pictogram is drawn inside them.
Factors & digit properties
- Divisors (32)
- 1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 23, 24, 28, 42, 46, 56, 69, 84, 92, 138, 161, 168, 184, 276, 322, 483, 552, 644, 966, 1288, 1932, 3864
- Prime factorisation
- 2^3 × 3 × 7 × 23
- Digit sum
- 21
- Digital root
- 3
Representations
- Decimal
- 3864
- Scientific notation
- 3.864 × 10^3
Roman numerals
M M M D C C C L X I V
MMMDCCCLXIV uses the subtractive pair IV: one before five — five minus one.
Binary
1 1 1 1 0 0 0 1 1 0 0 0
1 × 2,048 + 1 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 3,864
Octal
7 4 3 0
7 × 512 + 4 × 64 + 3 × 8 + 0 × 1 = 3,864
Hexadecimal
f 1 8
f × 256 + 1 × 16 + 8 × 1 = 3,864
Read as powers of two: 2,048 + 1,024 + 512 + 256 + 16 + 8 = 3,864.
In historical numeral systems
Egyptian
3 lotuses, 8 coils of rope, 6 hobbles, 4 strokes
3 × 1,000 + 8 × 100 + 6 × 10 + 4 × 1 = 3,864. 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
- Abundant number
- Harshad (Niven) number
Related numbers & connections
ISO 3864 fixes the colours and shapes, and ISO 7010 places standardised pictograms inside them.
View 7010 →Technology & computing
ISO 3864 specifies safety colours and geometric shapes for signs and markings. ISO 7010 places standardised pictograms within the shapes this standard defines.
DocumentedTechnology & computingGeography: International — ISO member bodiesPeriod: 1984–
Common questions
Is 3864 a prime number?
No, 3864 is not prime.
What are the factors of 3864?
The factors of 3864 are 1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 23, 24, 28, 42, 46, 56, 69, 84, 92, 138, 161, 168, 184, 276, 322, 483, 552, 644, 966, 1288, 1932, 3864.
What is 3864 in Roman numerals?
3864 in Roman numerals is MMMDCCCLXIV. IV is subtractive: one before five — five minus one. Written additively it would be MMMDCCCLXIIII, 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