122979729 has 4 divisors (see below), whose sum is σ = 163972976. Its totient is φ = 81986484.

The previous prime is 122979707. The next prime is 122979733. The reversal of 122979729 is 927979221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 122979729 - 2⁹ = 122979217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122974729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20496619 + ... + 20496624.

It is an arithmetic number, because the mean of its divisors is an integer number (40993244).

Almost surely, 2^122979729 is an apocalyptic number.

It is an amenable number.

122979729 is a deficient number, since it is larger than the sum of its proper divisors (40993247).

122979729 is an equidigital number, since it uses as much as digits as its factorization.

122979729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40993246.

The product of its digits is 285768, while the sum is 48.

The square root of 122979729 is about 11089.6225814948. The cubic root of 122979729 is about 497.2916616278.

The spelling of 122979729 in words is "one hundred twenty-two million, nine hundred seventy-nine thousand, seven hundred twenty-nine".