18656713 has 4 divisors (see below), whose sum is σ = 18675328. Its totient is φ = 18638100.

The previous prime is 18656669. The next prime is 18656717. The reversal of 18656713 is 31765681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18656713 - 2¹³ = 18648521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18656717) 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 3 ways as a sum of consecutive naturals, for example, 7713 + ... + 9838.

It is an arithmetic number, because the mean of its divisors is an integer number (4668832).

Almost surely, 2^18656713 is an apocalyptic number.

It is an amenable number.

18656713 is a deficient number, since it is larger than the sum of its proper divisors (18615).

18656713 is a wasteful number, since it uses less digits than its factorization.

18656713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18614.

The product of its digits is 30240, while the sum is 37.

The square root of 18656713 is about 4319.3417322550. The cubic root of 18656713 is about 265.2233218943.

The spelling of 18656713 in words is "eighteen million, six hundred fifty-six thousand, seven hundred thirteen".