723
The 723 is a voltage regulator building block.
- Odd
- Composite
Where 723 fits
Why 723 is special
It predates the fixed three-terminal regulators and gives access to the internal reference and error amplifier, so bench power supplies were built around it for years.
Factors & digit properties
- Divisors (4)
- 1, 3, 241, 723
- Prime factorisation
- 3 × 241
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 723
- Scientific notation
- 7.230 × 10^2
Roman numerals
D C C X X I I I
Binary
1 0 1 1 0 1 0 0 1 1
1 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 723
Octal
1 3 2 3
1 × 512 + 3 × 64 + 2 × 8 + 3 × 1 = 723
Hexadecimal
2 d 3
2 × 256 + d × 16 + 3 × 1 = 723
Read as powers of two: 512 + 128 + 64 + 16 + 2 + 1 = 723.
In historical numeral systems
Egyptian
7 coils of rope, 2 hobbles, 3 strokes
7 × 100 + 2 × 10 + 3 × 1 = 723. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 2 vertical wedges (sixties place), 3 vertical wedges (units place)
12 × 60 + 3 = 723. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
psi, then kappa, then gamma, marked as a numeral
psi-kappa-gamma + keraia
psi + kappa + gamma 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 shin, then kaf, then gimel
tav-shin-kaf-gimel
tav (400) + shin (300) + kaf (20) + gimel (3) = 723, 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
The 723 gave access to its internal reference and error amplifier, which the fixed three-terminal regulators that followed hid away.
View 7805 →Other connections
- developed from7805
why?
Strength 0.50, confidence "high".
Technology & computing
The 723 provides a reference, error amplifier and series pass transistor as separate accessible elements, allowing adjustable and current-limited supplies at the cost of external component count.
DocumentedTechnology & computingPeriod: 1967–
Common questions
Is 723 a prime number?
No, 723 is not prime.
What are the factors of 723?
The factors of 723 are 1, 3, 241, 723.
What is 723 in Roman numerals?
723 in Roman numerals is DCCXXIII.
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