404042839 has 2 divisors, whose sum is σ = 404042840. Its totient is φ = 404042838.

The previous prime is 404042831. The next prime is 404042857. The reversal of 404042839 is 938240404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404042839 - 2³ = 404042831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404042831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202021419 + 202021420.

It is an arithmetic number, because the mean of its divisors is an integer number (202021420).

Almost surely, 2^404042839 is an apocalyptic number.

404042839 is a deficient number, since it is larger than the sum of its proper divisors (1).

404042839 is an equidigital number, since it uses as much as digits as its factorization.

404042839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 404042839 is about 20100.8168739482. The cubic root of 404042839 is about 739.2803077114.

The spelling of 404042839 in words is "four hundred four million, forty-two thousand, eight hundred thirty-nine".