18400204 has 6 divisors (see below), whose sum is σ = 32200364. Its totient is φ = 9200100.

The previous prime is 18400177. The next prime is 18400237. The reversal of 18400204 is 40200481.

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 as a sum of consecutive naturals, namely, 2300022 + ... + 2300029.

Almost surely, 2^18400204 is an apocalyptic number.

It is an amenable number.

18400204 is a deficient number, since it is larger than the sum of its proper divisors (13800160).

18400204 is a wasteful number, since it uses less digits than its factorization.

18400204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600055 (or 4600053 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 18400204 is about 4289.5458967121. The cubic root of 18400204 is about 264.0022000123.

Adding to 18400204 its reverse (40200481), we get a palindrome (58600685).

The spelling of 18400204 in words is "eighteen million, four hundred thousand, two hundred four".