23979139 has 2 divisors, whose sum is σ = 23979140. Its totient is φ = 23979138.

The previous prime is 23979119. The next prime is 23979149. The reversal of 23979139 is 93197932.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23979139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23979095 and 23979104.

It is not a weakly prime, because it can be changed into another prime (23979119) 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 as a sum of consecutive naturals, namely, 11989569 + 11989570.

It is an arithmetic number, because the mean of its divisors is an integer number (11989570).

Almost surely, 2^23979139 is an apocalyptic number.

23979139 is a deficient number, since it is larger than the sum of its proper divisors (1).

23979139 is an equidigital number, since it uses as much as digits as its factorization.

23979139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 43.

The square root of 23979139 is about 4896.8499058068. The cubic root of 23979139 is about 288.3663154789.

The spelling of 23979139 in words is "twenty-three million, nine hundred seventy-nine thousand, one hundred thirty-nine".