18328388 has 36 divisors (see below), whose sum is σ = 36585360. Its totient is φ = 8008416.

The previous prime is 18328381. The next prime is 18328391. The reversal of 18328388 is 88382381.

It is not an unprimeable number, because it can be changed into a prime (18328381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12131 + ... + 13557.

It is an arithmetic number, because the mean of its divisors is an integer number (1016260).

Almost surely, 2^18328388 is an apocalyptic number.

It is an amenable number.

18328388 is a deficient number, since it is larger than the sum of its proper divisors (18256972).

18328388 is a wasteful number, since it uses less digits than its factorization.

18328388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476 (or 1461 counting only the distinct ones).

The product of its digits is 73728, while the sum is 41.

The square root of 18328388 is about 4281.1666634225. The cubic root of 18328388 is about 263.6582853101.

The spelling of 18328388 in words is "eighteen million, three hundred twenty-eight thousand, three hundred eighty-eight".