18199398 has 16 divisors (see below), whose sum is σ = 41598720. Its totient is φ = 5199816.

The previous prime is 18199381. The next prime is 18199421. The reversal of 18199398 is 89399181.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216618 + ... + 216701.

It is an arithmetic number, because the mean of its divisors is an integer number (2599920).

Almost surely, 2^18199398 is an apocalyptic number.

18199398 is an abundant number, since it is smaller than the sum of its proper divisors (23399322).

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

18199398 is a wasteful number, since it uses less digits than its factorization.

18199398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433331.

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

The square root of 18199398 is about 4266.0752454686. The cubic root of 18199398 is about 263.0383111986.

The spelling of 18199398 in words is "eighteen million, one hundred ninety-nine thousand, three hundred ninety-eight".