122 (number) explained

Number:	122
Divisor:	1, 2, 61, 122

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.

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

Notes and References

1. phi(sigma(k)).