857959 has 2 divisors, whose sum is σ = 857960. Its totient is φ = 857958.

The previous prime is 857957. The next prime is 857963. The reversal of 857959 is 959758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 857959 - 2¹ = 857957 is a prime.

Together with 857957, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428979 + 428980.

It is an arithmetic number, because the mean of its divisors is an integer number (428980).

2⁸⁵⁷⁹⁵⁹ is an apocalyptic number.

857959 is a deficient number, since it is larger than the sum of its proper divisors (1).

857959 is an equidigital number, since it uses as much as digits as its factorization.

857959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 43.

The square root of 857959 is about 926.2607624206. The cubic root of 857959 is about 95.0215648182.

The spelling of 857959 in words is "eight hundred fifty-seven thousand, nine hundred fifty-nine".