18643372 has 12 divisors (see below), whose sum is σ = 35591976. Its totient is φ = 8474240.

The previous prime is 18643367. The next prime is 18643403. The reversal of 18643372 is 27334681.

It is a happy 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, 211813 + ... + 211900.

It is an arithmetic number, because the mean of its divisors is an integer number (2965998).

Almost surely, 2^18643372 is an apocalyptic number.

It is an amenable number.

18643372 is a deficient number, since it is larger than the sum of its proper divisors (16948604).

18643372 is a wasteful number, since it uses less digits than its factorization.

18643372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423728 (or 423726 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 18643372 is about 4317.7971235342. The cubic root of 18643372 is about 265.1600883892.

The spelling of 18643372 in words is "eighteen million, six hundred forty-three thousand, three hundred seventy-two".