18318004 has 6 divisors (see below), whose sum is σ = 32056514. Its totient is φ = 9159000.

The previous prime is 18317989. The next prime is 18318007. The reversal of 18318004 is 40081381.

It can be written as a sum of positive squares in only one way, i.e., 17892900 + 425104 = 4230^2 + 652^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18318004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18318007) 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, 2289747 + ... + 2289754.

Almost surely, 2^18318004 is an apocalyptic number.

It is an amenable number.

18318004 is a deficient number, since it is larger than the sum of its proper divisors (13738510).

18318004 is a wasteful number, since it uses less digits than its factorization.

18318004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4579505 (or 4579503 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18318004 is about 4279.9537380677. The cubic root of 18318004 is about 263.6084837883.

Adding to 18318004 its reverse (40081381), we get a palindrome (58399385).

The spelling of 18318004 in words is "eighteen million, three hundred eighteen thousand, four".