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 Airport
172nd Battalion (Rocky Mountain Rangers), 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 U.S. Army at Grafenwöhr, Germany
USNS Apache (T-ATF-172) is a United States Navy Powhatan ocean tugboat
USNS Phoenix (T-AG-172) was a United States Navy Phoenix-class miscellaneous auxiliary ship following World War II
USS Anthony (DD-172) was a United States Navy Wickes class destroyer following World War I
USS Cape Johnson (AP-172) was a United States Navy troop transport ship during World War II
USS Clarion (AK-172) was a United States Navy Alamosa-class cargo ship in World War II
USS Cooner (DE-172) was a United States Navy Cannon class destroyer escort ship during World War II
USS Grimes (APA-172) was a United States Navy Haskell-class attack transport during World War II
USS Porpoise (SS-172) was a United States Navy Porpoise class diesel-electric submarine during World War II
Dana Kunze holds the world record for high diving at 172 feet
In squash, one of John White’s shots was clocked at a record 172 miles per hour
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 (one-seventy-two) associated with the Cessna 172
172 is also:
The year AD 172 or 172 BC
The atomic number of an element temporarily called Unseptbium
172 Baucis is a large S-type Main belt asteroid
