18099894 has 16 divisors (see below), whose sum is σ = 38105280. Its totient is φ = 5715720.

The previous prime is 18099869. The next prime is 18099929. The reversal of 18099894 is 49899081.

It is a super-2 number, since 2×18099894² = 655212325622472, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 79272 + ... + 79499.

It is an arithmetic number, because the mean of its divisors is an integer number (2381580).

Almost surely, 2^18099894 is an apocalyptic number.

18099894 is an abundant number, since it is smaller than the sum of its proper divisors (20005386).

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

18099894 is a wasteful number, since it uses less digits than its factorization.

18099894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158795.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 18099894 is about 4254.3970195552. The cubic root of 18099894 is about 262.5580533734.

The spelling of 18099894 in words is "eighteen million, ninety-nine thousand, eight hundred ninety-four".