123996979 has 4 divisors (see below), whose sum is σ = 129388176. Its totient is φ = 118605784.

The previous prime is 123996959. The next prime is 123996991. The reversal of 123996979 is 979699321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123996979 - 2⁵ = 123996947 is a prime.

It is a super-2 number, since 2×123996979² = 30750501602252882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123996949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2695564 + ... + 2695609.

It is an arithmetic number, because the mean of its divisors is an integer number (32347044).

Almost surely, 2^123996979 is an apocalyptic number.

123996979 is a deficient number, since it is larger than the sum of its proper divisors (5391197).

123996979 is an equidigital number, since it uses as much as digits as its factorization.

123996979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5391196.

The product of its digits is 1653372, while the sum is 55.

The square root of 123996979 is about 11135.3930779295. The cubic root of 123996979 is about 498.6590455641.

The spelling of 123996979 in words is "one hundred twenty-three million, nine hundred ninety-six thousand, nine hundred seventy-nine".