18240556 has 18 divisors (see below), whose sum is σ = 32816868. Its totient is φ = 8871120.

The previous prime is 18240529. The next prime is 18240577. The reversal of 18240556 is 65504281.

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, 3811 + ... + 7141.

Almost surely, 2^18240556 is an apocalyptic number.

It is an amenable number.

18240556 is a deficient number, since it is larger than the sum of its proper divisors (14576312).

18240556 is a wasteful number, since it uses less digits than its factorization.

18240556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3409 (or 3370 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 18240556 is about 4270.8963930304. The cubic root of 18240556 is about 263.2364492531.

The spelling of 18240556 in words is "eighteen million, two hundred forty thousand, five hundred fifty-six".