18040232 has 24 divisors (see below), whose sum is σ = 39348810. Its totient is φ = 7731360.

The previous prime is 18040229. The next prime is 18040249. The reversal of 18040232 is 23204081.

It can be written as a sum of positive squares in only one way, i.e., 10278436 + 7761796 = 3206^2 + 2786^2 .

It is a super-2 number, since 2×18040232² = 650899941227648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22619 + ... + 23402.

Almost surely, 2^18040232 is an apocalyptic number.

It is an amenable number.

18040232 is an abundant number, since it is smaller than the sum of its proper divisors (21308578).

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

18040232 is a wasteful number, since it uses less digits than its factorization.

18040232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46041 (or 46030 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 18040232 is about 4247.3794273646. The cubic root of 18040232 is about 262.2692490694.

The spelling of 18040232 in words is "eighteen million, forty thousand, two hundred thirty-two".