18116885 has 4 divisors (see below), whose sum is σ = 21740268. Its totient is φ = 14493504.

The previous prime is 18116873. The next prime is 18116911. The reversal of 18116885 is 58861181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13126129 + 4990756 = 3623^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 18116885 - 2⁴ = 18116869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1811684 + ... + 1811693.

It is an arithmetic number, because the mean of its divisors is an integer number (5435067).

Almost surely, 2^18116885 is an apocalyptic number.

It is an amenable number.

18116885 is a deficient number, since it is larger than the sum of its proper divisors (3623383).

18116885 is an equidigital number, since it uses as much as digits as its factorization.

18116885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3623382.

The product of its digits is 15360, while the sum is 38.

The square root of 18116885 is about 4256.3934263646. The cubic root of 18116885 is about 262.6401851375.

The spelling of 18116885 in words is "eighteen million, one hundred sixteen thousand, eight hundred eighty-five".