18318713 has 4 divisors (see below), whose sum is σ = 20935680. Its totient is φ = 15701748.

The previous prime is 18318709. The next prime is 18318779. The reversal of 18318713 is 31781381.

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 18318713 - 2² = 18318709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18318713.

It is not an unprimeable number, because it can be changed into a prime (18318913) 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, 1308473 + ... + 1308486.

It is an arithmetic number, because the mean of its divisors is an integer number (5233920).

Almost surely, 2^18318713 is an apocalyptic number.

It is an amenable number.

18318713 is a deficient number, since it is larger than the sum of its proper divisors (2616967).

18318713 is an equidigital number, since it uses as much as digits as its factorization.

18318713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616966.

The product of its digits is 4032, while the sum is 32.

The square root of 18318713 is about 4280.0365652644. The cubic root of 18318713 is about 263.6118847412.

The spelling of 18318713 in words is "eighteen million, three hundred eighteen thousand, seven hundred thirteen".