123299979 has 16 divisors (see below), whose sum is σ = 179642880. Its totient is φ = 74603360.

The previous prime is 123299959. The next prime is 123299983. The reversal of 123299979 is 979992321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 123299979 - 2⁹ = 123299467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123299959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19582 + ... + 25100.

It is an arithmetic number, because the mean of its divisors is an integer number (11227680).

Almost surely, 2^123299979 is an apocalyptic number.

123299979 is a deficient number, since it is larger than the sum of its proper divisors (56342901).

123299979 is a wasteful number, since it uses less digits than its factorization.

123299979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6210.

The product of its digits is 551124, while the sum is 51.

The square root of 123299979 is about 11104.0523683924. The cubic root of 123299979 is about 497.7229511725.

The spelling of 123299979 in words is "one hundred twenty-three million, two hundred ninety-nine thousand, nine hundred seventy-nine".