13623979 has 2 divisors, whose sum is σ = 13623980. Its totient is φ = 13623978.

The previous prime is 13623959. The next prime is 13624001. The reversal of 13623979 is 97932631.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13623979 is a prime.

It is a super-2 number, since 2×13623979² = 371225607584882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13623949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6811989 + 6811990.

It is an arithmetic number, because the mean of its divisors is an integer number (6811990).

Almost surely, 2^13623979 is an apocalyptic number.

13623979 is a deficient number, since it is larger than the sum of its proper divisors (1).

13623979 is an equidigital number, since it uses as much as digits as its factorization.

13623979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The square root of 13623979 is about 3691.0674607761. The cubic root of 13623979 is about 238.8368429453.

The spelling of 13623979 in words is "thirteen million, six hundred twenty-three thousand, nine hundred seventy-nine".