18316868 has 24 divisors (see below), whose sum is σ = 32789400. Its totient is φ = 8951040.

The previous prime is 18316867. The next prime is 18316889. The reversal of 18316868 is 86861381.

It can be written as a sum of positive squares in 4 ways, for example, as 407044 + 17909824 = 638^2 + 4232^2 .

It is not an unprimeable number, because it can be changed into a prime (18316867) 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 in 7 ways as a sum of consecutive naturals, for example, 43298 + ... + 43718.

It is an arithmetic number, because the mean of its divisors is an integer number (1366225).

Almost surely, 2^18316868 is an apocalyptic number.

It is an amenable number.

18316868 is a deficient number, since it is larger than the sum of its proper divisors (14472532).

18316868 is a wasteful number, since it uses less digits than its factorization.

18316868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647 (or 645 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 18316868 is about 4279.8210242953. The cubic root of 18316868 is about 263.6030344059.

The spelling of 18316868 in words is "eighteen million, three hundred sixteen thousand, eight hundred sixty-eight".