23928639 has 32 divisors (see below), whose sum is σ = 39062016. Its totient is φ = 12718080.

The previous prime is 23928637. The next prime is 23928643. The reversal of 23928639 is 93682932.

It is not a de Polignac number, because 23928639 - 2¹ = 23928637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23928639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23928631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34284 + ... + 34974.

It is an arithmetic number, because the mean of its divisors is an integer number (1220688).

Almost surely, 2^23928639 is an apocalyptic number.

23928639 is a deficient number, since it is larger than the sum of its proper divisors (15133377).

23928639 is a wasteful number, since it uses less digits than its factorization.

23928639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815.

The product of its digits is 139968, while the sum is 42.

The square root of 23928639 is about 4891.6908119790. The cubic root of 23928639 is about 288.1637403188.

The spelling of 23928639 in words is "twenty-three million, nine hundred twenty-eight thousand, six hundred thirty-nine".