18319685 has 8 divisors (see below), whose sum is σ = 22040856. Its totient is φ = 14617600.

The previous prime is 18319681. The next prime is 18319687. The reversal of 18319685 is 58691381.

It can be written as a sum of positive squares in 4 ways, for example, as 1852321 + 16467364 = 1361^2 + 4058^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18319685 - 2² = 18319681 is a prime.

It is a super-2 number, since 2×18319685² = 671221716998450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18319681) 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 7 ways as a sum of consecutive naturals, for example, 2564 + ... + 6573.

It is an arithmetic number, because the mean of its divisors is an integer number (2755107).

Almost surely, 2^18319685 is an apocalyptic number.

It is an amenable number.

18319685 is a deficient number, since it is larger than the sum of its proper divisors (3721171).

18319685 is an equidigital number, since it uses as much as digits as its factorization.

18319685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9543.

The product of its digits is 51840, while the sum is 41.

The square root of 18319685 is about 4280.1501141899. The cubic root of 18319685 is about 263.6165471179.

The spelling of 18319685 in words is "eighteen million, three hundred nineteen thousand, six hundred eighty-five".