18811372 has 24 divisors (see below), whose sum is σ = 34241760. Its totient is φ = 9031680.

The previous prime is 18811361. The next prime is 18811391. The reversal of 18811372 is 27311881.

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 7 ways as a sum of consecutive naturals, for example, 29497 + ... + 30127.

It is an arithmetic number, because the mean of its divisors is an integer number (1426740).

Almost surely, 2^18811372 is an apocalyptic number.

It is an amenable number.

18811372 is a deficient number, since it is larger than the sum of its proper divisors (15430388).

18811372 is a wasteful number, since it uses less digits than its factorization.

18811372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 919 counting only the distinct ones).

The product of its digits is 2688, while the sum is 31.

The square root of 18811372 is about 4337.2078575969. The cubic root of 18811372 is about 265.9541820947.

The spelling of 18811372 in words is "eighteen million, eight hundred eleven thousand, three hundred seventy-two".