856005 has 16 divisors (see below), whose sum is σ = 1382400. Its totient is φ = 452288.

The previous prime is 855997. The next prime is 856021. The reversal of 856005 is 500658.

It is a cyclic number.

It is not a de Polignac number, because 856005 - 2³ = 855997 is a prime.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 856005.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2044 + ... + 2426.

It is an arithmetic number, because the mean of its divisors is an integer number (86400).

2⁸⁵⁶⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

856005 is a deficient number, since it is larger than the sum of its proper divisors (526395).

856005 is a wasteful number, since it uses less digits than its factorization.

856005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 856005 is about 925.2053826043. The cubic root of 856005 is about 94.9493728400.

The spelling of 856005 in words is "eight hundred fifty-six thousand, five".