18311916 has 48 divisors (see below), whose sum is σ = 49070336. Its totient is φ = 5206464.

The previous prime is 18311893. The next prime is 18311947. The reversal of 18311916 is 61911381.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22875 + ... + 23661.

Almost surely, 2^18311916 is an apocalyptic number.

It is an amenable number.

18311916 is an abundant number, since it is smaller than the sum of its proper divisors (30758420).

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

18311916 is a wasteful number, since it uses less digits than its factorization.

18311916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1076 counting only the distinct ones).

The product of its digits is 1296, while the sum is 30.

The square root of 18311916 is about 4279.2424563233. The cubic root of 18311916 is about 263.5792770714.

The spelling of 18311916 in words is "eighteen million, three hundred eleven thousand, nine hundred sixteen".