18009204 has 12 divisors (see below), whose sum is σ = 42021504. Its totient is φ = 6003064.

The previous prime is 18009197. The next prime is 18009223. The reversal of 18009204 is 40290081.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 750372 + ... + 750395.

It is an arithmetic number, because the mean of its divisors is an integer number (3501792).

Almost surely, 2^18009204 is an apocalyptic number.

It is an amenable number.

18009204 is an abundant number, since it is smaller than the sum of its proper divisors (24012300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18009204 is a wasteful number, since it uses less digits than its factorization.

18009204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500774 (or 1500772 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 18009204 is about 4243.7252502960. The cubic root of 18009204 is about 262.1188008906.

Adding to 18009204 its reverse (40290081), we get a palindrome (58299285).

The spelling of 18009204 in words is "eighteen million, nine thousand, two hundred four".