856065 has 32 divisors (see below), whose sum is σ = 1622016. Its totient is φ = 377280.

The previous prime is 856061. The next prime is 856073. The reversal of 856065 is 560658.

It is not a de Polignac number, because 856065 - 2² = 856061 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (856061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3124 + ... + 3386.

It is an arithmetic number, because the mean of its divisors is an integer number (50688).

It is a Proth number, since it is equal to 209 ⋅ 2¹² + 1 and 209 < 2¹².

2⁸⁵⁶⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

856065 is a deficient number, since it is larger than the sum of its proper divisors (765951).

856065 is a wasteful number, since it uses less digits than its factorization.

856065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 856065 is about 925.2378072690. The cubic root of 856065 is about 94.9515912185.

The spelling of 856065 in words is "eight hundred fifty-six thousand, sixty-five".