18568240 has 20 divisors (see below), whose sum is σ = 43171344. Its totient is φ = 7427264.

The previous prime is 18568237. The next prime is 18568261. The reversal of 18568240 is 4286581.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 18568196 and 18568205.

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, 115972 + ... + 116131.

Almost surely, 2^18568240 is an apocalyptic number.

18568240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18568240 is an abundant number, since it is smaller than the sum of its proper divisors (24603104).

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

18568240 is a wasteful number, since it uses less digits than its factorization.

18568240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232116 (or 232110 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 18568240 is about 4309.0880705783. The cubic root of 18568240 is about 264.8034141879.

The spelling of 18568240 in words is "eighteen million, five hundred sixty-eight thousand, two hundred forty".