856753 has 4 divisors (see below), whose sum is σ = 861300. Its totient is φ = 852208.

The previous prime is 856733. The next prime is 856759. The reversal of 856753 is 357658.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 431649 + 425104 = 657^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 856753 - 2⁵ = 856721 is a prime.

It is a Duffinian number.

856753 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (856759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978 + ... + 2371.

It is an arithmetic number, because the mean of its divisors is an integer number (215325).

2⁸⁵⁶⁷⁵³ is an apocalyptic number.

It is an amenable number.

856753 is a deficient number, since it is larger than the sum of its proper divisors (4547).

856753 is a wasteful number, since it uses less digits than its factorization.

856753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546.

The product of its digits is 25200, while the sum is 34.

The square root of 856753 is about 925.6095289051. The cubic root of 856753 is about 94.9770212198.

The spelling of 856753 in words is "eight hundred fifty-six thousand, seven hundred fifty-three".