204004090 has 16 divisors (see below), whose sum is σ = 368735400. Its totient is φ = 81262080.

The previous prime is 204004061. The next prime is 204004093. The reversal of 204004090 is 90400402.

It is a Cunningham number, because it is equal to 14283²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 153437769 + 50566321 = 12387^2 + 7111^2 .

It is not an unprimeable number, because it can be changed into a prime (204004093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39915 + ... + 44734.

Almost surely, 2^204004090 is an apocalyptic number.

204004090 is a deficient number, since it is larger than the sum of its proper divisors (164731310).

204004090 is a wasteful number, since it uses less digits than its factorization.

204004090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84897.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 204004090 is about 14283.0000350067. Note that the first 4 decimals coincide. The cubic root of 204004090 is about 588.6804657912.

Adding to 204004090 its reverse (90400402), we get a palindrome (294404492).

The spelling of 204004090 in words is "two hundred four million, four thousand, ninety".