18668685 has 16 divisors (see below), whose sum is σ = 34137216. Its totient is φ = 8534208.

The previous prime is 18668641. The next prime is 18668687. The reversal of 18668685 is 58686681.

It is a happy number.

It is not a de Polignac number, because 18668685 - 2⁷ = 18668557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18668687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88794 + ... + 89003.

It is an arithmetic number, because the mean of its divisors is an integer number (2133576).

Almost surely, 2^18668685 is an apocalyptic number.

18668685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18668685 is a deficient number, since it is larger than the sum of its proper divisors (15468531).

18668685 is a wasteful number, since it uses less digits than its factorization.

18668685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177812.

The product of its digits is 552960, while the sum is 48.

The square root of 18668685 is about 4320.7273693210. The cubic root of 18668685 is about 265.2800409721.

The spelling of 18668685 in words is "eighteen million, six hundred sixty-eight thousand, six hundred eighty-five".