857839 has 2 divisors, whose sum is σ = 857840. Its totient is φ = 857838.

The previous prime is 857827. The next prime is 857851. The reversal of 857839 is 938758.

It is a balanced prime because it is at equal distance from previous prime (857827) and next prime (857851).

It is a cyclic number.

It is not a de Polignac number, because 857839 - 2⁷ = 857711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857809) 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, 428919 + 428920.

It is an arithmetic number, because the mean of its divisors is an integer number (428920).

2⁸⁵⁷⁸³⁹ is an apocalyptic number.

857839 is a deficient number, since it is larger than the sum of its proper divisors (1).

857839 is an equidigital number, since it uses as much as digits as its factorization.

857839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 857839 is about 926.1959835801. The cubic root of 857839 is about 95.0171344902.

The spelling of 857839 in words is "eight hundred fifty-seven thousand, eight hundred thirty-nine".