18318164 has 6 divisors (see below), whose sum is σ = 32056794. Its totient is φ = 9159080.

The previous prime is 18318161. The next prime is 18318191. The reversal of 18318164 is 46181381.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 85264 = 4270^2 + 292^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18318164.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18318161) 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 as a sum of consecutive naturals, namely, 2289767 + ... + 2289774.

It is an arithmetic number, because the mean of its divisors is an integer number (5342799).

Almost surely, 2^18318164 is an apocalyptic number.

It is an amenable number.

18318164 is a deficient number, since it is larger than the sum of its proper divisors (13738630).

18318164 is a wasteful number, since it uses less digits than its factorization.

18318164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4579545 (or 4579543 counting only the distinct ones).

The product of its digits is 4608, while the sum is 32.

The square root of 18318164 is about 4279.9724298177. The cubic root of 18318164 is about 263.6092512889.

The spelling of 18318164 in words is "eighteen million, three hundred eighteen thousand, one hundred sixty-four".