18166772 has 24 divisors (see below), whose sum is σ = 35076552. Its totient is φ = 8179200.

The previous prime is 18166763. The next prime is 18166783. The reversal of 18166772 is 27766181.

It can be written as a sum of positive squares in 4 ways, for example, as 155236 + 18011536 = 394^2 + 4244^2 .

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 7 ways as a sum of consecutive naturals, for example, 2129 + ... + 6392.

It is an arithmetic number, because the mean of its divisors is an integer number (1461523).

Almost surely, 2^18166772 is an apocalyptic number.

It is an amenable number.

18166772 is a deficient number, since it is larger than the sum of its proper divisors (16909780).

18166772 is a wasteful number, since it uses less digits than its factorization.

18166772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8579 (or 8577 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 18166772 is about 4262.2496407414. The cubic root of 18166772 is about 262.8810345441.

The spelling of 18166772 in words is "eighteen million, one hundred sixty-six thousand, seven hundred seventy-two".