18115716 has 12 divisors (see below), whose sum is σ = 42270032. Its totient is φ = 6038568.

The previous prime is 18115667. The next prime is 18115723. The reversal of 18115716 is 61751181.

It is a tau number, because it is divible by the number of its divisors (12).

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, 754810 + ... + 754833.

Almost surely, 2^18115716 is an apocalyptic number.

It is an amenable number.

18115716 is an abundant number, since it is smaller than the sum of its proper divisors (24154316).

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

18115716 is a wasteful number, since it uses less digits than its factorization.

18115716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509650 (or 1509648 counting only the distinct ones).

The product of its digits is 1680, while the sum is 30.

The square root of 18115716 is about 4256.2561013172. The cubic root of 18115716 is about 262.6345360247.

Adding to 18115716 its reverse (61751181), we get a palindrome (79866897).

The spelling of 18115716 in words is "eighteen million, one hundred fifteen thousand, seven hundred sixteen".