18199904 has 24 divisors (see below), whose sum is σ = 36596448. Its totient is φ = 8905600.

The previous prime is 18199889. The next prime is 18199919. The reversal of 18199904 is 40999181.

It is an interprime number because it is at equal distance from previous prime (18199889) and next prime (18199919).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4547 + ... + 7554.

It is an arithmetic number, because the mean of its divisors is an integer number (1524852).

Almost surely, 2^18199904 is an apocalyptic number.

It is an amenable number.

18199904 is an abundant number, since it is smaller than the sum of its proper divisors (18396544).

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

18199904 is a wasteful number, since it uses less digits than its factorization.

18199904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12158 (or 12150 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 18199904 is about 4266.1345501519. The cubic root of 18199904 is about 263.0407489377.

The spelling of 18199904 in words is "eighteen million, one hundred ninety-nine thousand, nine hundred four".