857957 has 2 divisors, whose sum is σ = 857958. Its totient is φ = 857956.

The previous prime is 857953. The next prime is 857959. The reversal of 857957 is 759758.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776161 + 81796 = 881^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 857957 - 2² = 857953 is a prime.

Together with 857959, it forms a pair of twin primes.

It is a Chen prime.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428978 + 428979.

It is an arithmetic number, because the mean of its divisors is an integer number (428979).

2⁸⁵⁷⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

857957 is a deficient number, since it is larger than the sum of its proper divisors (1).

857957 is an equidigital number, since it uses as much as digits as its factorization.

857957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 41.

The square root of 857957 is about 926.2596828104. The cubic root of 857957 is about 95.0214909828.

The spelling of 857957 in words is "eight hundred fifty-seven thousand, nine hundred fifty-seven".