18705685 has 8 divisors (see below), whose sum is σ = 22497696. Its totient is φ = 14930640.

The previous prime is 18705677. The next prime is 18705689. The reversal of 18705685 is 58650781.

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

It is not a de Polignac number, because 18705685 - 2³ = 18705677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705689) 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 7 ways as a sum of consecutive naturals, for example, 1671 + ... + 6340.

It is an arithmetic number, because the mean of its divisors is an integer number (2812212).

Almost surely, 2^18705685 is an apocalyptic number.

It is an amenable number.

18705685 is a deficient number, since it is larger than the sum of its proper divisors (3792011).

18705685 is an equidigital number, since it uses as much as digits as its factorization.

18705685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8483.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 18705685 is about 4325.0069364106. The cubic root of 18705685 is about 265.4551806815.

The spelling of 18705685 in words is "eighteen million, seven hundred five thousand, six hundred eighty-five".