7812
The 7812 is a fixed twelve-volt regulator from the same family.
- Even
- Composite
Where 7812 fits
Why 7812 is special
The last two digits of a 78xx part number are its output voltage, which is an unusually honest naming scheme for a semiconductor.
Factors & digit properties
- Divisors (36)
- 1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 31, 36, 42, 62, 63, 84, 93, 124, 126, 186, 217, 252, 279, 372, 434, 558, 651, 868, 1116, 1302, 1953, 2604, 3906, 7812
- Prime factorisation
- 2^2 × 3^2 × 7 × 31
- Digit sum
- 18
- Digital root
- 9
Representations
- Decimal
- 7812
- Scientific notation
- 7.812 × 10^3
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
1 1 1 1 0 1 0 0 0 0 1 0 0
1 × 4,096 + 1 × 2,048 + 1 × 1,024 + 1 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 7,812
Octal
1 7 2 0 4
1 × 4,096 + 7 × 512 + 2 × 64 + 0 × 8 + 4 × 1 = 7,812
Hexadecimal
1 e 8 4
1 × 4,096 + e × 256 + 8 × 16 + 4 × 1 = 7,812
Read as powers of two: 4,096 + 2,048 + 1,024 + 512 + 128 + 4 = 7,812.
In historical numeral systems
Egyptian
7 lotuses, 8 coils of rope, 1 hobble, 2 strokes
7 × 1,000 + 8 × 100 + 1 × 10 + 2 × 1 = 7,812. 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
The last two digits of a 78xx part are its output voltage, so the family is read directly from the number.
View 7805 →Numbers Around Us
- appears alongside7805
why?
Strength 0.50, confidence "high".
Technology & computing
The 7812 provides a regulated twelve-volt output within the 78xx series, where the final digits denote output voltage and the 79xx series provides the negative equivalents.
DocumentedTechnology & computingPeriod: 1970s–
Common questions
Is 7812 a prime number?
No, 7812 is not prime.
What are the factors of 7812?
The factors of 7812 are 1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 31, 36, 42, 62, 63, 84, 93, 124, 126, 186, 217, 252, 279, 372, 434, 558, 651, 868, 1116, 1302, 1953, 2604, 3906, 7812.
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