18115686 has 24 divisors (see below), whose sum is σ = 40209624. Its totient is φ = 5891040.

The previous prime is 18115667. The next prime is 18115723. The reversal of 18115686 is 68651181.

It is a self number, because there is not a number n which added to its sum of digits gives 18115686.

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 in 11 ways as a sum of consecutive naturals, for example, 11536 + ... + 13011.

It is an arithmetic number, because the mean of its divisors is an integer number (1675401).

Almost surely, 2^18115686 is an apocalyptic number.

18115686 is an abundant number, since it is smaller than the sum of its proper divisors (22093938).

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

18115686 is a wasteful number, since it uses less digits than its factorization.

18115686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24596 (or 24593 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 18115686 is about 4256.2525770917. The cubic root of 18115686 is about 262.6343910486.

The spelling of 18115686 in words is "eighteen million, one hundred fifteen thousand, six hundred eighty-six".