18331316 has 24 divisors (see below), whose sum is σ = 32973696. Its totient is φ = 8912960.

The previous prime is 18331303. The next prime is 18331331. The reversal of 18331316 is 61313381.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52655 + ... + 53001.

It is an arithmetic number, because the mean of its divisors is an integer number (1373904).

Almost surely, 2^18331316 is an apocalyptic number.

It is an amenable number.

18331316 is a deficient number, since it is larger than the sum of its proper divisors (14642380).

18331316 is a wasteful number, since it uses less digits than its factorization.

18331316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 677 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 18331316 is about 4281.5086126271. The cubic root of 18331316 is about 263.6723245581.

Adding to 18331316 its reverse (61313381), we get a palindrome (79644697).

The spelling of 18331316 in words is "eighteen million, three hundred thirty-one thousand, three hundred sixteen".