18321804 has 36 divisors (see below), whose sum is σ = 46781280. Its totient is φ = 6045600.

The previous prime is 18321769. The next prime is 18321817. The reversal of 18321804 is 40812381.

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 1117 + ... + 6155.

It is an arithmetic number, because the mean of its divisors is an integer number (1299480).

Almost surely, 2^18321804 is an apocalyptic number.

It is an amenable number.

18321804 is an abundant number, since it is smaller than the sum of its proper divisors (28459476).

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

18321804 is a wasteful number, since it uses less digits than its factorization.

18321804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5150 (or 5145 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18321804 is about 4280.3976450793. The cubic root of 18321804 is about 263.6267107192.

The spelling of 18321804 in words is "eighteen million, three hundred twenty-one thousand, eight hundred four".