18318279 has 16 divisors (see below), whose sum is σ = 27978752. Its totient is φ = 10443168.

The previous prime is 18318277. The next prime is 18318329. The reversal of 18318279 is 97281381.

It is not a de Polignac number, because 18318279 - 2¹ = 18318277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18318271) 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 15 ways as a sum of consecutive naturals, for example, 12162 + ... + 13584.

It is an arithmetic number, because the mean of its divisors is an integer number (1748672).

Almost surely, 2^18318279 is an apocalyptic number.

18318279 is a deficient number, since it is larger than the sum of its proper divisors (9660473).

18318279 is a wasteful number, since it uses less digits than its factorization.

18318279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046.

The product of its digits is 24192, while the sum is 39.

The square root of 18318279 is about 4279.9858644626. The cubic root of 18318279 is about 263.6098029272.

The spelling of 18318279 in words is "eighteen million, three hundred eighteen thousand, two hundred seventy-nine".