172 (one hundred [and] seventy-two) is the natural number following 171 and preceding 173.
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(x) over the first twenty-three integers. 172 is also a member of the Lazy Caterer's Sequence.
172 is a repdigit in base 6 (444), as well as in bases 42, 85, and 171.
172d Airlift Wing airlift of the United States Air National Guard at Jackson-Evers International Airport172nd Battalion (Rocky Mountain Rangers), CEF unit of the Canadian Expeditionary Force during World War I172nd Fighter Squadron unit of the Michigan Air National Guard172nd Infantry Brigade of the U.S. Army at Grafenwöhr, GermanyUSNS Apache (T-ATF-172) is a United States Navy Powhatan ocean tugboatUSNS Phoenix (T-AG-172) was a United States Navy Phoenix-class miscellaneous auxiliary ship following World War IIUSS Anthony (DD-172) was a United States Navy Wickes class destroyer following World War IUSS Cape Johnson (AP-172) was a United States Navy troop transport ship during World War IIUSS Clarion (AK-172) was a United States Navy Alamosa-class cargo ship in World War IIUSS Cooner (DE-172) was a United States Navy Cannon class destroyer escort ship during World War IIUSS Grimes (APA-172) was a United States Navy Haskell-class attack transport during World War IIUSS Porpoise (SS-172) was a United States Navy Porpoise class diesel-electric submarine during World War IIDana Kunze holds the world record for high diving at 172 feetIn squash, one of John White’s shots was clocked at a record 172 miles per hourBritish Rail Class 172The London Buses headquarters at 172 Buckingham Palace RoadThe East 172nd Avenue light rail station on the MAX Blue Line in Gresham, OregonThe Cessna 172 Skyhawk 4-seat, single-engine aircraft. More Cessna 172s were built than any other aircraftCessna models: 172, 172A, 172AB, 172C, 172D, 172E, 172F, 172G, 172H, 172I, 172J, 172K, 172L, 172M, 172N, 172O, 172P, 172Q Cutlass, 172R, 172RG, and 172SThe planned diesel-powered Cessna 172TDAviation frequency radio exchange (one-seventy-two) associated with the Cessna 172172 is also:
The year AD 172 or 172 BCThe atomic number of an element temporarily called Unseptbium172 Baucis is a large S-type Main belt asteroid