505904939 has 2 divisors, whose sum is σ = 505904940. Its totient is φ = 505904938.

The previous prime is 505904929. The next prime is 505904977. The reversal of 505904939 is 939409505.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505904939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505904939.

It is not a weakly prime, because it can be changed into another prime (505904929) 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, 252952469 + 252952470.

It is an arithmetic number, because the mean of its divisors is an integer number (252952470).

Almost surely, 2^505904939 is an apocalyptic number.

505904939 is a deficient number, since it is larger than the sum of its proper divisors (1).

505904939 is an equidigital number, since it uses as much as digits as its factorization.

505904939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 505904939 is about 22492.3306706975. The cubic root of 505904939 is about 796.8128081855.

The spelling of 505904939 in words is "five hundred five million, nine hundred four thousand, nine hundred thirty-nine".