18315532 has 6 divisors (see below), whose sum is σ = 32052188. Its totient is φ = 9157764.

The previous prime is 18315529. The next prime is 18315533. The reversal of 18315532 is 23551381.

It is a self number, because there is not a number n which added to its sum of digits gives 18315532.

It is not an unprimeable number, because it can be changed into a prime (18315533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2289438 + ... + 2289445.

Almost surely, 2^18315532 is an apocalyptic number.

It is an amenable number.

18315532 is a deficient number, since it is larger than the sum of its proper divisors (13736656).

18315532 is a wasteful number, since it uses less digits than its factorization.

18315532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578887 (or 4578885 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 18315532 is about 4279.6649401559. The cubic root of 18315532 is about 263.5966253368.

The spelling of 18315532 in words is "eighteen million, three hundred fifteen thousand, five hundred thirty-two".