18105872 has 10 divisors (see below), whose sum is σ = 35080158. Its totient is φ = 9052928.

The previous prime is 18105863. The next prime is 18105929. The reversal of 18105872 is 27850181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9834496 + 8271376 = 3136^2 + 2876^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565793 + ... + 565824.

Almost surely, 2^18105872 is an apocalyptic number.

It is an amenable number.

18105872 is a deficient number, since it is larger than the sum of its proper divisors (16974286).

18105872 is a wasteful number, since it uses less digits than its factorization.

18105872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131625 (or 1131619 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 18105872 is about 4255.0995288007. The cubic root of 18105872 is about 262.5869559234.

The spelling of 18105872 in words is "eighteen million, one hundred five thousand, eight hundred seventy-two".