825407839 has 2 divisors, whose sum is σ = 825407840. Its totient is φ = 825407838.

The previous prime is 825407801. The next prime is 825407857. The reversal of 825407839 is 938704528.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 825407839 - 2⁷ = 825407711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (825402839) 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, 412703919 + 412703920.

It is an arithmetic number, because the mean of its divisors is an integer number (412703920).

Almost surely, 2^825407839 is an apocalyptic number.

825407839 is a deficient number, since it is larger than the sum of its proper divisors (1).

825407839 is an equidigital number, since it uses as much as digits as its factorization.

825407839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 825407839 is about 28729.9119212016. The cubic root of 825407839 is about 938.0432507490.

The spelling of 825407839 in words is "eight hundred twenty-five million, four hundred seven thousand, eight hundred thirty-nine".