856797 has 4 divisors (see below), whose sum is σ = 1142400. Its totient is φ = 571196.

The previous prime is 856789. The next prime is 856799. The reversal of 856797 is 797658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 856797 - 2³ = 856789 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856799) 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 in 3 ways as a sum of consecutive naturals, for example, 142797 + ... + 142802.

It is an arithmetic number, because the mean of its divisors is an integer number (285600).

2⁸⁵⁶⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

856797 is a deficient number, since it is larger than the sum of its proper divisors (285603).

856797 is a wasteful number, since it uses less digits than its factorization.

856797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285602.

The product of its digits is 105840, while the sum is 42.

The square root of 856797 is about 925.6332967218. The cubic root of 856797 is about 94.9786470938.

It can be divided in two parts, 856 and 797, that added together give a triangular number (1653 = T₅₇).

The spelling of 856797 in words is "eight hundred fifty-six thousand, seven hundred ninety-seven".