18660772 has 12 divisors (see below), whose sum is σ = 35168476. Its totient is φ = 8612640.

The previous prime is 18660769. The next prime is 18660779. The reversal of 18660772 is 27706681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3481956 + 15178816 = 1866^2 + 3896^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18660779) by changing a digit.

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, 179379 + ... + 179482.

Almost surely, 2^18660772 is an apocalyptic number.

It is an amenable number.

18660772 is a deficient number, since it is larger than the sum of its proper divisors (16507704).

18660772 is a wasteful number, since it uses less digits than its factorization.

18660772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358878 (or 358876 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 18660772 is about 4319.8115699646. The cubic root of 18660772 is about 265.2425547106.

The spelling of 18660772 in words is "eighteen million, six hundred sixty thousand, seven hundred seventy-two".