427
427 is the displacement of the most sought-after big blocks.
- Odd
- Composite
Where 427 fits
Why 427 is special
Both Chevrolet and Ford built 427 engines, and the coincidence of displacement between rivals is a consequence of a 7-litre racing class limit.
Factors & digit properties
- Divisors (4)
- 1, 7, 61, 427
- Prime factorisation
- 7 × 61
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 427
- Scientific notation
- 4.270 × 10^2
Roman numerals
C D X X V I I
CDXXVII uses the subtractive pair CD: a hundred before five hundred — five hundred minus a hundred.
Binary
1 1 0 1 0 1 0 1 1
1 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 427
Octal
6 5 3
6 × 64 + 5 × 8 + 3 × 1 = 427
Hexadecimal
1 a b
1 × 256 + a × 16 + b × 1 = 427
Read as powers of two: 256 + 128 + 32 + 8 + 2 + 1 = 427.
In historical numeral systems
Egyptian
4 coils of rope, 2 hobbles, 7 strokes
4 × 100 + 2 × 10 + 7 × 1 = 427. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
7 vertical wedges (sixties place), 7 vertical wedges (units place)
7 × 60 + 7 = 427. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
upsilon, then kappa, then zeta, marked as a numeral
upsilon-kappa-zeta + keraia
upsilon + kappa + zeta 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 kaf, then zayin
tav-kaf-zayin
tav (400) + kaf (20) + zayin (7) = 427, 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
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
American engines were identified by cubic inch displacement, so a number rather than a name names them.
View 454 →Ford built both, one for racing categories near a seven-litre limit and one compact enough for a Cobra.
View 289 →Technology & computing
Chevrolet and Ford both produced 427 cubic inch V8 engines, a size close to the 7-litre limit applied in several racing categories of the period.
DocumentedTechnology & computingGeography: United StatesPeriod: 1963–
Common questions
Is 427 a prime number?
No, 427 is not prime.
What are the factors of 427?
The factors of 427 are 1, 7, 61, 427.
What is 427 in Roman numerals?
427 in Roman numerals is CDXXVII. CD is subtractive: a hundred before five hundred — five hundred minus a hundred. Written additively it would be CCCCXXVII, 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