172 (number)
172 is the natural number following 171 and preceding 173.In mathematics
172 is an even number, a composite number and a deficient number. It is also a 30-gonal number.
172 is a noncototient integer, as well as the sum of Euler's totient function φ over the first twenty-three integers. 172 is also a member of the Lazy Caterer's Sequence.
172 is a repdigit in base 6, as well as in bases 42, 85, and 171.- 172d Airlift Wing airlift of the United States Air National Guard at Jackson-Evers International Airport
- 172nd Battalion, CEF unit of the Canadian Expeditionary Force during World War I
- 172nd Fighter Squadron unit of the Michigan Air National Guard
- 172nd Infantry Brigade of the United States Army at Grafenwöhr, Germany
- is a United States Navy
- was a United States Navy Phoenix-class miscellaneous auxiliary ship following World War II
- was a United States Navy following World War I
- was a United States Navy troop transport ship during World War II
- was a United States Navy in World War II
- was a United States Navy ship during World War II
- was a United States Navy during World War II
- was a United States Navy Porpoise-class diesel-electric submarine during World War II
In transportation
- British Rail Class 172
- The London Buses headquarters at 172 Buckingham Palace Road
- The East 172nd Avenue light rail station on the MAX Blue Line in Gresham, Oregon
- The Cessna 172 Skyhawk 4-seat, single-engine aircraft. More Cessna 172s were built than any other aircraft
- * Cessna models: 172, 172A, 172AB, 172C, 172D, 172E, 172F, 172G, 172H, 172I, 172J, 172K, 172L, 172M, 172N, 172O, 172P, 172Q Cutlass, 172R, 172RG, and 172S
- * The planned diesel-powered Cessna 172TD
- * Aviation frequency radio exchange associated with the Cessna 172
In other fields
172 is also:
