172 (number)

172 (one hundred [and] seventy-two) is the natural number following 171 and preceding 173.

← 171 172 173 →
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Cardinal	one hundred seventy-two
Ordinal	172nd (one hundred seventy-second)
Factorization	2^2 × 43
Divisors	1, 2, 4, 43, 86, 172
Greek numeral	ΡΟΒ´
Roman numeral	CLXXII
Binary	101011002
Ternary	201013
Octal	2548
Duodecimal	12412
Hexadecimal	AC16

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 United States Army at Grafenwöhr, Germany
• USNS Apache (T-ATF-172) is a United States Navy Powhatan-class 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 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.