856897 has 2 divisors, whose sum is σ = 856898. Its totient is φ = 856896.

The previous prime is 856853. The next prime is 856901. The reversal of 856897 is 798658.

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., 641601 + 215296 = 801^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 856897 - 2¹¹ = 854849 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (856847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428448 + 428449.

It is an arithmetic number, because the mean of its divisors is an integer number (428449).

2⁸⁵⁶⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

856897 is a deficient number, since it is larger than the sum of its proper divisors (1).

856897 is an equidigital number, since it uses as much as digits as its factorization.

856897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 43.

The square root of 856897 is about 925.6873122173. The cubic root of 856897 is about 94.9823420551.

The spelling of 856897 in words is "eight hundred fifty-six thousand, eight hundred ninety-seven".