18985113 has 24 divisors (see below), whose sum is σ = 32354816. Its totient is φ = 10497600.

The previous prime is 18985093. The next prime is 18985157. The reversal of 18985113 is 31158981.

It is not a de Polignac number, because 18985113 - 2⁵ = 18985081 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18985163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2908 + ... + 6813.

Almost surely, 2^18985113 is an apocalyptic number.

It is an amenable number.

18985113 is a deficient number, since it is larger than the sum of its proper divisors (13369703).

18985113 is a wasteful number, since it uses less digits than its factorization.

18985113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9765 (or 9762 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 18985113 is about 4357.1909528961. The cubic root of 18985113 is about 266.7704545653.

The spelling of 18985113 in words is "eighteen million, nine hundred eighty-five thousand, one hundred thirteen".