172 (number)

← 171 172 173 →
← 170 171 172 173 174 175 176 177 178 179 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred seventy-two
Ordinal	172nd (one hundred and seventy-second)
Factorization	2^2× 43
Divisors	1, 2, 4, 43, 86, 172
Roman numeral	CLXXII
Binary	101011002
Ternary	201013
Quaternary	22304
Quinary	11425
Senary	4446
Octal	2548
Duodecimal	12412
Hexadecimal	AC16
Vigesimal	8C20
Base 36	4S36

172 (one hundred [and] seventy-two) 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.^[1]

172 is a noncototient integer,^[2] 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.^[3]

172 is a repdigit in base 6 (444), as well as in bases 42, 85, and 171.

In the military

• 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

In sports

• 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

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 (one-seventy-two) associated with the Cessna 172

In other fields

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

See also

• 172 (disambiguation)
• Mir-172 microRNA precursor family
• List of highways numbered 172
• United States Supreme Court cases, Volume 172
• United Nations Security Council Resolution 172
• Quincy, Illinois Public School District 172

External links

• Number Facts and Trivia: 172
• The Number 172
• Number Gossip: 172
• The Positive Integer 172
• Prime curiosities: 172
• VirtueScience: 172

References

1. "Sloane's A254474 : 30-gonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
2. "Sloane's A005278 : Noncototients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.
3. "Sloane's A000124 : Central polygonal numbers (the Lazy Caterer's sequence)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-26.