18328988 has 12 divisors (see below), whose sum is σ = 32127480. Its totient is φ = 9149712.

The previous prime is 18328987. The next prime is 18328991. The reversal of 18328988 is 88982381.

It is a super-2 number, since 2×18328988² = 671903602208288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18328987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623 + ... + 6086.

It is an arithmetic number, because the mean of its divisors is an integer number (2677290).

Almost surely, 2^18328988 is an apocalyptic number.

It is an amenable number.

18328988 is a deficient number, since it is larger than the sum of its proper divisors (13798492).

18328988 is a wasteful number, since it uses less digits than its factorization.

18328988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7396 (or 7394 counting only the distinct ones).

The product of its digits is 221184, while the sum is 47.

The square root of 18328988 is about 4281.2367372057. The cubic root of 18328988 is about 263.6611623269.

The spelling of 18328988 in words is "eighteen million, three hundred twenty-eight thousand, nine hundred eighty-eight".