18238964 has 6 divisors (see below), whose sum is σ = 31918194. Its totient is φ = 9119480.

The previous prime is 18238937. The next prime is 18238981. The reversal of 18238964 is 46983281.

It can be written as a sum of positive squares in only one way, i.e., 10510564 + 7728400 = 3242^2 + 2780^2 .

It is a congruent number.

It is an unprimeable number.

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, 2279867 + ... + 2279874.

It is an arithmetic number, because the mean of its divisors is an integer number (5319699).

Almost surely, 2^18238964 is an apocalyptic number.

It is an amenable number.

18238964 is a deficient number, since it is larger than the sum of its proper divisors (13679230).

18238964 is a wasteful number, since it uses less digits than its factorization.

18238964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4559745 (or 4559743 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 18238964 is about 4270.7100112276. The cubic root of 18238964 is about 263.2287907764.

The spelling of 18238964 in words is "eighteen million, two hundred thirty-eight thousand, nine hundred sixty-four".