204464639 has 2 divisors, whose sum is σ = 204464640. Its totient is φ = 204464638.

The previous prime is 204464629. The next prime is 204464647. The reversal of 204464639 is 936464402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204464639 - 2⁸ = 204464383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204464609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102232319 + 102232320.

It is an arithmetic number, because the mean of its divisors is an integer number (102232320).

Almost surely, 2^204464639 is an apocalyptic number.

204464639 is a deficient number, since it is larger than the sum of its proper divisors (1).

204464639 is an equidigital number, since it uses as much as digits as its factorization.

204464639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 204464639 is about 14299.1132242528. The cubic root of 204464639 is about 589.1231242955.

The spelling of 204464639 in words is "two hundred four million, four hundred sixty-four thousand, six hundred thirty-nine".