18505372 has 12 divisors (see below), whose sum is σ = 32414536. Its totient is φ = 9244080.

The previous prime is 18505307. The next prime is 18505381. The reversal of 18505372 is 27350581.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 7222 + ... + 9442.

Almost surely, 2^18505372 is an apocalyptic number.

It is an amenable number.

18505372 is a deficient number, since it is larger than the sum of its proper divisors (13909164).

18505372 is a wasteful number, since it uses less digits than its factorization.

18505372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308 (or 4306 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 18505372 is about 4301.7870705092. The cubic root of 18505372 is about 264.5042207819.

The spelling of 18505372 in words is "eighteen million, five hundred five thousand, three hundred seventy-two".