18090304 has 14 divisors (see below), whose sum is σ = 35898074. Its totient is φ = 9045120.

The previous prime is 18090301. The next prime is 18090341. The reversal of 18090304 is 40309081.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 2408704 = 3960^2 + 1552^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18090301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 141267 + ... + 141394.

Almost surely, 2^18090304 is an apocalyptic number.

It is an amenable number.

18090304 is a deficient number, since it is larger than the sum of its proper divisors (17807770).

18090304 is an equidigital number, since it uses as much as digits as its factorization.

18090304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282673 (or 282663 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 18090304 is about 4253.2698009884. The cubic root of 18090304 is about 262.5116741596.

Adding to 18090304 its reverse (40309081), we get a palindrome (58399385).

The spelling of 18090304 in words is "eighteen million, ninety thousand, three hundred four".