856985 has 8 divisors (see below), whose sum is σ = 1039176. Its totient is φ = 678400.

The previous prime is 856969. The next prime is 856993. The reversal of 856985 is 589658.

856985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 534361 + 322624 = 731^2 + 568^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 856985 - 2⁴ = 856969 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 856985.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344 + ... + 1353.

It is an arithmetic number, because the mean of its divisors is an integer number (129897).

2⁸⁵⁶⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

856985 is a deficient number, since it is larger than the sum of its proper divisors (182191).

856985 is a wasteful number, since it uses less digits than its factorization.

856985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803.

The product of its digits is 86400, while the sum is 41.

The square root of 856985 is about 925.7348432462. The cubic root of 856985 is about 94.9855933832.

The spelling of 856985 in words is "eight hundred fifty-six thousand, nine hundred eighty-five".