172
The Cessna 172 is the most-produced aircraft in history.
- Even
- Composite
Where 172 fits
Why 172 is special
More than 44,000 have been built since 1956, and it is still in production — a run no other aircraft type has matched.
Same number, different meanings
How 172 is understood across different contexts — never implying one meaning because of another.
- Mathematics
More than 44,000 have been built since 1956, and it is still in production — a run no other aircraft type has matched.
- Technology & computing
The Cessna 172 Skyhawk entered production in 1956 and has exceeded 44,000 units. Its high wing, fixed gear and benign handling made it the standard basic trainer across much of the world.
- Everyday life
E172 is iron oxides and hydroxides, used to colour confectionery and some pharmaceutical coatings in shades from yellow through red to black.
Factors & digit properties
- Divisors (6)
- 1, 2, 4, 43, 86, 172
- Prime factorisation
- 2^2 × 43
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 172
- Binary
- 10101100
- Octal
- 254
- Hexadecimal
- ac
- Roman numeral
- CLXXII
- Scientific notation
- 1.720 × 10^2
Other mathematical patterns
- Deficient number
Related numbers & connections
The 152 exists because the four-seat 172 was more aircraft than a student pilot needs.
View 152 →Technology & computing
The Cessna 172 Skyhawk entered production in 1956 and has exceeded 44,000 units. Its high wing, fixed gear and benign handling made it the standard basic trainer across much of the world.
DocumentedTechnology & computingGeography: United States, flown worldwidePeriod: 1956–
Everyday life
E172 is iron oxides and hydroxides, used to colour confectionery and some pharmaceutical coatings in shades from yellow through red to black.
DocumentedEveryday lifeGeography: European Union and states adopting the E number systemPeriod: 1962–
Common questions
Is 172 a prime number?
No, 172 is not prime.
What are the factors of 172?
The factors of 172 are 1, 2, 4, 43, 86, 172.
What is 172 in Roman numerals?
172 in Roman numerals is CLXXII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 3 August 2026