18993198 has 32 divisors (see below), whose sum is σ = 45699840. Its totient is φ = 5140800.

The previous prime is 18993181. The next prime is 18993203. The reversal of 18993198 is 89139981.

It is a Curzon number.

It is a congruent number.

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, 11103 + ... + 12698.

It is an arithmetic number, because the mean of its divisors is an integer number (1428120).

Almost surely, 2^18993198 is an apocalyptic number.

18993198 is an abundant number, since it is smaller than the sum of its proper divisors (26706642).

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

18993198 is a wasteful number, since it uses less digits than its factorization.

18993198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23832.

The product of its digits is 139968, while the sum is 48.

The square root of 18993198 is about 4358.1186307855. The cubic root of 18993198 is about 266.8083181452.

It can be divided in two parts, 18993 and 198, that added together give a palindrome (19191).

The spelling of 18993198 in words is "eighteen million, nine hundred ninety-three thousand, one hundred ninety-eight".