856983 has 4 divisors (see below), whose sum is σ = 1142648. Its totient is φ = 571320.

The previous prime is 856969. The next prime is 856993. The reversal of 856983 is 389658.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 856983 - 2¹³ = 848791 is a prime.

It is a D-number.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856903) 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, 142828 + ... + 142833.

It is an arithmetic number, because the mean of its divisors is an integer number (285662).

2⁸⁵⁶⁹⁸³ is an apocalyptic number.

856983 is a deficient number, since it is larger than the sum of its proper divisors (285665).

856983 is a wasteful number, since it uses less digits than its factorization.

856983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285664.

The product of its digits is 51840, while the sum is 39.

The square root of 856983 is about 925.7337630226. The cubic root of 856983 is about 94.9855194919.

The spelling of 856983 in words is "eight hundred fifty-six thousand, nine hundred eighty-three".