18328556 has 6 divisors (see below), whose sum is σ = 32074980. Its totient is φ = 9164276.

The previous prime is 18328549. The next prime is 18328573. The reversal of 18328556 is 65582381.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2291066 + ... + 2291073.

It is an arithmetic number, because the mean of its divisors is an integer number (5345830).

Almost surely, 2^18328556 is an apocalyptic number.

It is an amenable number.

18328556 is a deficient number, since it is larger than the sum of its proper divisors (13746424).

18328556 is a wasteful number, since it uses less digits than its factorization.

18328556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4582143 (or 4582141 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 18328556 is about 4281.1862841974. The cubic root of 18328556 is about 263.6590908811.

The spelling of 18328556 in words is "eighteen million, three hundred twenty-eight thousand, five hundred fifty-six".