18328986 has 96 divisors (see below), whose sum is σ = 46060560. Its totient is φ = 5225472.

The previous prime is 18328979. The next prime is 18328987. The reversal of 18328986 is 68982381.

It can be written as a sum of positive squares in 8 ways, for example, as 10595025 + 7733961 = 3255^2 + 2781^2 .

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 47 ways as a sum of consecutive naturals, for example, 251046 + ... + 251118.

Almost surely, 2^18328986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18328986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23030280).

18328986 is an abundant number, since it is smaller than the sum of its proper divisors (27731574).

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

18328986 is a wasteful number, since it uses less digits than its factorization.

18328986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 157 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 18328986 is about 4281.2365036284. The cubic root of 18328986 is about 263.6611527370.

The spelling of 18328986 in words is "eighteen million, three hundred twenty-eight thousand, nine hundred eighty-six".