18028986 has 32 divisors (see below), whose sum is σ = 38223360. Its totient is φ = 5653296.

The previous prime is 18028973. The next prime is 18028999. The reversal of 18028986 is 68982081.

It is an interprime number because it is at equal distance from previous prime (18028973) and next prime (18028999).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18565 + ... + 19511.

It is an arithmetic number, because the mean of its divisors is an integer number (1194480).

Almost surely, 2^18028986 is an apocalyptic number.

18028986 is an abundant number, since it is smaller than the sum of its proper divisors (20194374).

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

18028986 is a wasteful number, since it uses less digits than its factorization.

18028986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 18028986 is about 4246.0553458475. The cubic root of 18028986 is about 262.2147395510.

The spelling of 18028986 in words is "eighteen million, twenty-eight thousand, nine hundred eighty-six".