18985628 has 6 divisors (see below), whose sum is σ = 33224856. Its totient is φ = 9492812.

The previous prime is 18985619. The next prime is 18985643. The reversal of 18985628 is 82658981.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2373200 + ... + 2373207.

It is an arithmetic number, because the mean of its divisors is an integer number (5537476).

Almost surely, 2^18985628 is an apocalyptic number.

It is an amenable number.

18985628 is a deficient number, since it is larger than the sum of its proper divisors (14239228).

18985628 is a wasteful number, since it uses less digits than its factorization.

18985628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4746411 (or 4746409 counting only the distinct ones).

The product of its digits is 276480, while the sum is 47.

The square root of 18985628 is about 4357.2500502037. The cubic root of 18985628 is about 266.7728667280.

The spelling of 18985628 in words is "eighteen million, nine hundred eighty-five thousand, six hundred twenty-eight".