18331312 has 20 divisors (see below), whose sum is σ = 35834760. Its totient is φ = 9083648.

The previous prime is 18331303. The next prime is 18331331. The reversal of 18331312 is 21313381.

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 in 3 ways as a sum of consecutive naturals, for example, 3262 + ... + 6877.

It is an arithmetic number, because the mean of its divisors is an integer number (1791738).

Almost surely, 2^18331312 is an apocalyptic number.

It is an amenable number.

18331312 is a deficient number, since it is larger than the sum of its proper divisors (17503448).

18331312 is a wasteful number, since it uses less digits than its factorization.

18331312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10260 (or 10254 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 18331312 is about 4281.5081455020. The cubic root of 18331312 is about 263.6723053798.

Adding to 18331312 its reverse (21313381), we get a palindrome (39644693).

The spelling of 18331312 in words is "eighteen million, three hundred thirty-one thousand, three hundred twelve".