18223713 has 12 divisors (see below), whose sum is σ = 26363428. Its totient is φ = 12130560.

The previous prime is 18223703. The next prime is 18223757. The reversal of 18223713 is 31732281.

It can be written as a sum of positive squares in 2 ways, for example, as 5349969 + 12873744 = 2313^2 + 3588^2 .

It is not a de Polignac number, because 18223713 - 2¹⁰ = 18222689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18223703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7353 + ... + 9513.

Almost surely, 2^18223713 is an apocalyptic number.

It is an amenable number.

18223713 is a deficient number, since it is larger than the sum of its proper divisors (8139715).

18223713 is a wasteful number, since it uses less digits than its factorization.

18223713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104 (or 3101 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 18223713 is about 4268.9241033310. The cubic root of 18223713 is about 263.1554017076.

Adding to 18223713 its reverse (31732281), we get a palindrome (49955994).

The spelling of 18223713 in words is "eighteen million, two hundred twenty-three thousand, seven hundred thirteen".