204405434 has 4 divisors (see below), whose sum is σ = 306608154. Its totient is φ = 102202716.

The previous prime is 204405431. The next prime is 204405451. The reversal of 204405434 is 434504402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 204404209 + 1225 = 14297^2 + 35^2 .

It is not an unprimeable number, because it can be changed into a prime (204405431) 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 as a sum of consecutive naturals, namely, 51101357 + ... + 51101360.

Almost surely, 2^204405434 is an apocalyptic number.

204405434 is a deficient number, since it is larger than the sum of its proper divisors (102202720).

204405434 is a wasteful number, since it uses less digits than its factorization.

204405434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102202719.

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 204405434 is about 14297.0428410913. The cubic root of 204405434 is about 589.0662564318.

Adding to 204405434 its reverse (434504402), we get a palindrome (638909836).

The spelling of 204405434 in words is "two hundred four million, four hundred five thousand, four hundred thirty-four".