204391927439 has 16 divisors (see below), whose sum is σ = 240384960000. Its totient is φ = 170116425504.

The previous prime is 204391927429. The next prime is 204391927561. The reversal of 204391927439 is 934729193402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204391927439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204391927429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661499 + ... + 919980.

It is an arithmetic number, because the mean of its divisors is an integer number (15024060000).

Almost surely, 2^204391927439 is an apocalyptic number.

204391927439 is a deficient number, since it is larger than the sum of its proper divisors (35993032561).

204391927439 is a wasteful number, since it uses less digits than its factorization.

204391927439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582022.

The product of its (nonzero) digits is 2939328, while the sum is 53.

The spelling of 204391927439 in words is "two hundred four billion, three hundred ninety-one million, nine hundred twenty-seven thousand, four hundred thirty-nine".