18689128 has 16 divisors (see below), whose sum is σ = 35095680. Its totient is φ = 9330288.

The previous prime is 18689093. The next prime is 18689131. The reversal of 18689128 is 82198681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5551 + ... + 8257.

It is an arithmetic number, because the mean of its divisors is an integer number (2193480).

Almost surely, 2^18689128 is an apocalyptic number.

It is an amenable number.

18689128 is a deficient number, since it is larger than the sum of its proper divisors (16406552).

18689128 is a wasteful number, since it uses less digits than its factorization.

18689128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576 (or 3572 counting only the distinct ones).

The product of its digits is 55296, while the sum is 43.

The square root of 18689128 is about 4323.0924116887. The cubic root of 18689128 is about 265.3768366055.

The spelling of 18689128 in words is "eighteen million, six hundred eighty-nine thousand, one hundred twenty-eight".