122 (number)

Short description: Natural number

| <- 121  | 122 |  123 ->

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← 120 121 122 123 124 125 126 127 128 129 →

List of numbers — Integers

← 0 100 200 300 400 500 600 700 800 900 →

Cardinal| one hundred twenty-two
Ordinal| 122nd
(one hundred twenty-second)
Factorization| 2 × 61
Divisors| 1, 2, 61, 122
Greek numeral| ΡΚΒ´
Roman numeral| CXXII
Binary| 11110102
Ternary| 111123
Quaternary| 13224
Quinary| 4425
Senary| 3226
Octal| 1728
Duodecimal| A212
Hexadecimal| 7A16
Vigesimal| 6220
Base 36| 3E36

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

## Contents

* 1 In mathematics
* 2 In other fields
* 3 See also
* 4 References

## 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.

122 is the sum of squares of the divisors of 11.

φ(122) = φ(σ(122)).[1]

## In other fields

* The atomic number of the chemical element unbibium
* The emergency telephone number in several countries
* The number of men of Michmas at the census (Bible, Nehemiah 7:31)
* The Enroute Flight Advisory Service (EFAS) "Flight Watch" frequency: 122.0 MHz
* The oldest age in years to which a human being has ever been authenticated to live (Jeanne Calment).

## See also

* List of highways numbered 122
* United Nations Security Council Resolution 122

## References

1. ↑ Sloane, N. J. A., ed. "Sequence A006872". OEIS Foundation. https://oeis.org/A006872.

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