172 (number)

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← 171 172 173 →
Cardinal one hundred seventy-two
Ordinal 172nd
(one hundred seventy-second)
Factorization 22× 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[edit]

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[edit]


In sports[edit]

In transportation[edit]

In other fields[edit]

172 is also:

See also[edit]

External links[edit]

References[edit]

  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.