18688116 has 12 divisors (see below), whose sum is σ = 43605632. Its totient is φ = 6229368.

The previous prime is 18688091. The next prime is 18688139. The reversal of 18688116 is 61188681.

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

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 3 ways as a sum of consecutive naturals, for example, 778660 + ... + 778683.

Almost surely, 2^18688116 is an apocalyptic number.

It is an amenable number.

18688116 is an abundant number, since it is smaller than the sum of its proper divisors (24917516).

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

18688116 is a wasteful number, since it uses less digits than its factorization.

18688116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557350 (or 1557348 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The square root of 18688116 is about 4322.9753642601. The cubic root of 18688116 is about 265.3720465442.

The spelling of 18688116 in words is "eighteen million, six hundred eighty-eight thousand, one hundred sixteen".