18331012 has 12 divisors (see below), whose sum is σ = 36662080. Its totient is φ = 7856136.

The previous prime is 18331009. The next prime is 18331031. The reversal of 18331012 is 21013381.

18331012 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327312 + ... + 327367.

Almost surely, 2^18331012 is an apocalyptic number.

It is an amenable number.

18331012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18331012 is a wasteful number, since it uses less digits than its factorization.

18331012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654690 (or 654688 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 18331012 is about 4281.4731109748. The cubic root of 18331012 is about 263.6708670008.

Adding to 18331012 its reverse (21013381), we get a palindrome (39344393).

The spelling of 18331012 in words is "eighteen million, three hundred thirty-one thousand, twelve".