18907685 has 8 divisors (see below), whose sum is σ = 22898040. Its totient is φ = 14986944.

The previous prime is 18907673. The next prime is 18907687. The reversal of 18907685 is 58670981.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4330561 + 14577124 = 2081^2 + 3818^2 .

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 18907685 - 2¹² = 18903589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18907687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16802 + ... + 17891.

It is an arithmetic number, because the mean of its divisors is an integer number (2862255).

Almost surely, 2^18907685 is an apocalyptic number.

It is an amenable number.

18907685 is a deficient number, since it is larger than the sum of its proper divisors (3990355).

18907685 is a wasteful number, since it uses less digits than its factorization.

18907685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34807.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 18907685 is about 4348.2967929984. The cubic root of 18907685 is about 266.4072990287.

The spelling of 18907685 in words is "eighteen million, nine hundred seven thousand, six hundred eighty-five".