18398394 has 32 divisors (see below), whose sum is σ = 46727040. Its totient is φ = 5256576.

The previous prime is 18398353. The next prime is 18398417. The reversal of 18398394 is 49389381.

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 15 ways as a sum of consecutive naturals, for example, 23959 + ... + 24714.

It is an arithmetic number, because the mean of its divisors is an integer number (1460220).

Almost surely, 2^18398394 is an apocalyptic number.

18398394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18398394 is an abundant number, since it is smaller than the sum of its proper divisors (28328646).

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

18398394 is a wasteful number, since it uses less digits than its factorization.

18398394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48691 (or 48685 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 18398394 is about 4289.3349134802. The cubic root of 18398394 is about 263.9935432305.

The spelling of 18398394 in words is "eighteen million, three hundred ninety-eight thousand, three hundred ninety-four".