18998199 has 32 divisors (see below), whose sum is σ = 31380480. Its totient is φ = 11260800.

The previous prime is 18998191. The next prime is 18998209. The reversal of 18998199 is 99189981.

It is not a de Polignac number, because 18998199 - 2³ = 18998191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18998191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13279 + ... + 14639.

It is an arithmetic number, because the mean of its divisors is an integer number (980640).

Almost surely, 2^18998199 is an apocalyptic number.

18998199 is a deficient number, since it is larger than the sum of its proper divisors (12382281).

18998199 is a wasteful number, since it uses less digits than its factorization.

18998199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428 (or 1422 counting only the distinct ones).

The product of its digits is 419904, while the sum is 54.

The square root of 18998199 is about 4358.6923497765. The cubic root of 18998199 is about 266.8317333929.

The spelling of 18998199 in words is "eighteen million, nine hundred ninety-eight thousand, one hundred ninety-nine".