23218538 has 16 divisors (see below), whose sum is σ = 40729920. Its totient is φ = 9719136.

The previous prime is 23218529. The next prime is 23218541. The reversal of 23218538 is 83581232.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18683 + ... + 19886.

It is an arithmetic number, because the mean of its divisors is an integer number (2545620).

Almost surely, 2^23218538 is an apocalyptic number.

23218538 is a deficient number, since it is larger than the sum of its proper divisors (17511382).

23218538 is a wasteful number, since it uses less digits than its factorization.

23218538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38621.

The product of its digits is 11520, while the sum is 32.

The square root of 23218538 is about 4818.5618186343. The cubic root of 23218538 is about 285.2845746864.

The spelling of 23218538 in words is "twenty-three million, two hundred eighteen thousand, five hundred thirty-eight".