18390998 has 16 divisors (see below), whose sum is σ = 29249664. Its totient is φ = 8657280.

The previous prime is 18390979. The next prime is 18391013. The reversal of 18390998 is 89909381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1715 + ... + 6302.

It is an arithmetic number, because the mean of its divisors is an integer number (1828104).

Almost surely, 2^18390998 is an apocalyptic number.

18390998 is a deficient number, since it is larger than the sum of its proper divisors (10858666).

18390998 is a wasteful number, since it uses less digits than its factorization.

18390998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8087.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 18390998 is about 4288.4726884988. The cubic root of 18390998 is about 263.9581640930.

The spelling of 18390998 in words is "eighteen million, three hundred ninety thousand, nine hundred ninety-eight".