172 (number)

From Wikipedia, the free encyclopedia
Jump to: navigation, search
← 171 172 173 →
Cardinal one hundred seventy-two
Ordinal 172nd
(one hundred seventy-second)
Factorization 22× 43
Divisors 1, 2, 4, 43, 86, 172
Greek numeral ΡΟΒ´
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.