18505772 has 24 divisors (see below), whose sum is σ = 35016240. Its totient is φ = 8527680.

The previous prime is 18505769. The next prime is 18505783. The reversal of 18505772 is 27750581.

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, 479 + ... + 6102.

It is an arithmetic number, because the mean of its divisors is an integer number (1459010).

Almost surely, 2^18505772 is an apocalyptic number.

It is an amenable number.

18505772 is a deficient number, since it is larger than the sum of its proper divisors (16510468).

18505772 is a wasteful number, since it uses less digits than its factorization.

18505772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6641 (or 6639 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 18505772 is about 4301.8335625638. The cubic root of 18505772 is about 264.5061265515.

The spelling of 18505772 in words is "eighteen million, five hundred five thousand, seven hundred seventy-two".