18307713 has 4 divisors (see below), whose sum is σ = 24410288. Its totient is φ = 12205140.

The previous prime is 18307699. The next prime is 18307733. The reversal of 18307713 is 31770381.

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 de Polignac number, because none of the positive numbers 2^k-18307713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18307733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3051283 + ... + 3051288.

It is an arithmetic number, because the mean of its divisors is an integer number (6102572).

Almost surely, 2^18307713 is an apocalyptic number.

It is an amenable number.

18307713 is a deficient number, since it is larger than the sum of its proper divisors (6102575).

18307713 is an equidigital number, since it uses as much as digits as its factorization.

18307713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6102574.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 18307713 is about 4278.7513365467. The cubic root of 18307713 is about 263.5591097212.

The spelling of 18307713 in words is "eighteen million, three hundred seven thousand, seven hundred thirteen".