18315772 has 12 divisors (see below), whose sum is σ = 33739720. Its totient is φ = 8675856.

The previous prime is 18315763. The next prime is 18315809. The reversal of 18315772 is 27751381.

It is a congruent 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, 120423 + ... + 120574.

Almost surely, 2^18315772 is an apocalyptic number.

It is an amenable number.

18315772 is a deficient number, since it is larger than the sum of its proper divisors (15423948).

18315772 is a wasteful number, since it uses less digits than its factorization.

18315772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241020 (or 241018 counting only the distinct ones).

The product of its digits is 11760, while the sum is 34.

The square root of 18315772 is about 4279.6929796423. The cubic root of 18315772 is about 263.5977766896.

The spelling of 18315772 in words is "eighteen million, three hundred fifteen thousand, seven hundred seventy-two".