122 (number)

← 121 122 123 →
Cardinalone hundred twenty-two
Ordinal122nd
(one hundred twenty-second)
Factorization2 × 61
Divisors1, 2, 61, 122
Greek numeralΡΚΒ´
Roman numeralCXXII, cxxii
Binary11110102
Ternary111123
Senary3226
Octal1728
DuodecimalA212
Hexadecimal7A16

122 (one hundred [and] twenty-two) is the natural number following 121 and preceding 123.

In mathematics

122 is a nontotient since there is no integer with exactly 122 coprimes below it. Nor is there an integer with exactly 122 integers with common factors below it, making 122 a noncototient.

122 is a semiprime.

φ(122) = φ(σ(122)).[1]

References

  1. ^ Sloane, N. J. A. (ed.). "Sequence A006872". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.


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