486
The Intel 486 brought the maths coprocessor onto the main chip.
- Even
- Composite
Where 486 fits
Why 486 is special
Floating-point arithmetic had needed a separate optional chip; the 486 integrated it, which made fast decimal maths something software could simply assume. That assumption is why 3D graphics and spreadsheets stopped being specialist workloads.
Factors & digit properties
- Divisors (12)
- 1, 2, 3, 6, 9, 18, 27, 54, 81, 162, 243, 486
- Prime factorisation
- 2 × 3^5
- Digit sum
- 18
- Digital root
- 9
Representations
- Decimal
- 486
- Scientific notation
- 4.860 × 10^2
Roman numerals
C D L X X X V I
CDLXXXVI uses the subtractive pair CD: a hundred before five hundred — five hundred minus a hundred.
Binary
1 1 1 1 0 0 1 1 0
1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 0 × 1 = 486
Octal
7 4 6
7 × 64 + 4 × 8 + 6 × 1 = 486
Hexadecimal
1 e 6
1 × 256 + e × 16 + 6 × 1 = 486
Read as powers of two: 256 + 128 + 64 + 32 + 4 + 2 = 486.
In historical numeral systems
Egyptian
4 coils of rope, 8 hobbles, 6 strokes
4 × 100 + 8 × 10 + 6 × 1 = 486. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
8 vertical wedges (sixties place), 6 vertical wedges (units place)
8 × 60 + 6 = 486. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
upsilon, then pi, then stigma, marked as a numeral
upsilon-pi-stigma + keraia
upsilon + pi + 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 pe, then vav
tav-pe-vav
tav (400) + pe (80) + vav (6) = 486, 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
- Abundant number
- Harshad (Niven) number
Related numbers & connections
The 486 brought the floating-point coprocessor onto the main die, so software could finally assume fast decimal arithmetic was present.
View 386 →Other connections
- developed from386
why?
Strength 0.50, confidence "high".
Technology & computing
Floating-point arithmetic had required a separate coprocessor that most machines did not have, so software could not assume it. The 486 integrated it, and that assumption is what made 3D graphics and heavy spreadsheet work ordinary rather than specialist.
DocumentedTechnology & computingPeriod: 1989
Common questions
Is 486 a prime number?
No, 486 is not prime.
What are the factors of 486?
The factors of 486 are 1, 2, 3, 6, 9, 18, 27, 54, 81, 162, 243, 486.
What is 486 in Roman numerals?
486 in Roman numerals is CDLXXXVI. CD is subtractive: a hundred before five hundred — five hundred minus a hundred. Written additively it would be CCCCLXXXVI, 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