18661372 has 12 divisors (see below), whose sum is σ = 34077456. Its totient is φ = 8924960.

The previous prime is 18661369. The next prime is 18661387. The reversal of 18661372 is 27316681.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101329 + ... + 101512.

It is an arithmetic number, because the mean of its divisors is an integer number (2839788).

Almost surely, 2^18661372 is an apocalyptic number.

It is an amenable number.

18661372 is a deficient number, since it is larger than the sum of its proper divisors (15416084).

18661372 is a wasteful number, since it uses less digits than its factorization.

18661372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202868 (or 202866 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 18661372 is about 4319.8810168800. The cubic root of 18661372 is about 265.2453974624.

The spelling of 18661372 in words is "eighteen million, six hundred sixty-one thousand, three hundred seventy-two".