18085816 has 32 divisors (see below), whose sum is σ = 39075840. Its totient is φ = 7687008.

The previous prime is 18085799. The next prime is 18085817. The reversal of 18085816 is 61858081.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18085817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5841 + ... + 8383.

It is an arithmetic number, because the mean of its divisors is an integer number (1221120).

Almost surely, 2^18085816 is an apocalyptic number.

It is an amenable number.

18085816 is an abundant number, since it is smaller than the sum of its proper divisors (20990024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18085816 is a wasteful number, since it uses less digits than its factorization.

18085816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683 (or 2679 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 18085816 is about 4252.7421741742. The cubic root of 18085816 is about 262.4899636374.

The spelling of 18085816 in words is "eighteen million, eighty-five thousand, eight hundred sixteen".