18205872 has 20 divisors (see below), whose sum is σ = 47031960. Its totient is φ = 6068608.

The previous prime is 18205867. The next prime is 18205909. The reversal of 18205872 is 27850281.

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, 189597 + ... + 189692.

It is an arithmetic number, because the mean of its divisors is an integer number (2351598).

Almost surely, 2^18205872 is an apocalyptic number.

18205872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18205872 is an abundant number, since it is smaller than the sum of its proper divisors (28826088).

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

18205872 is a wasteful number, since it uses less digits than its factorization.

18205872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379300 (or 379294 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 18205872 is about 4266.8339550538. The cubic root of 18205872 is about 263.0694973610.

The spelling of 18205872 in words is "eighteen million, two hundred five thousand, eight hundred seventy-two".