18686685 has 8 divisors (see below), whose sum is σ = 29898720. Its totient is φ = 9966224.

The previous prime is 18686651. The next prime is 18686711. The reversal of 18686685 is 58668681.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18686685 - 2¹⁶ = 18621149 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 622875 + ... + 622904.

It is an arithmetic number, because the mean of its divisors is an integer number (3737340).

Almost surely, 2^18686685 is an apocalyptic number.

18686685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18686685 is a deficient number, since it is larger than the sum of its proper divisors (11212035).

18686685 is a wasteful number, since it uses less digits than its factorization.

18686685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245787.

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

The square root of 18686685 is about 4322.8098500859. The cubic root of 18686685 is about 265.3652729509.

The spelling of 18686685 in words is "eighteen million, six hundred eighty-six thousand, six hundred eighty-five".