18099844 has 12 divisors (see below), whose sum is σ = 36199744. Its totient is φ = 7757064.

The previous prime is 18099821. The next prime is 18099853. The reversal of 18099844 is 44899081.

18099844 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18099844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323184 + ... + 323239.

Almost surely, 2^18099844 is an apocalyptic number.

18099844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18099844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18099844 is a wasteful number, since it uses less digits than its factorization.

18099844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646434 (or 646432 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 18099844 is about 4254.3911432777. The cubic root of 18099844 is about 262.5578116056.

The spelling of 18099844 in words is "eighteen million, ninety-nine thousand, eight hundred forty-four".