204405135 has 64 divisors (see below), whose sum is σ = 379537920. Its totient is φ = 92897280.

The previous prime is 204405133. The next prime is 204405151. The reversal of 204405135 is 531504402.

It is not a de Polignac number, because 204405135 - 2¹ = 204405133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204405133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 353967 + ... + 354543.

It is an arithmetic number, because the mean of its divisors is an integer number (5930280).

Almost surely, 2^204405135 is an apocalyptic number.

204405135 is a deficient number, since it is larger than the sum of its proper divisors (175132785).

204405135 is a wasteful number, since it uses less digits than its factorization.

204405135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 204405135 is about 14297.0323843796. The cubic root of 204405135 is about 589.0659692071.

Adding to 204405135 its reverse (531504402), we get a palindrome (735909537).

The spelling of 204405135 in words is "two hundred four million, four hundred five thousand, one hundred thirty-five".