856673 has 4 divisors (see below), whose sum is σ = 861588. Its totient is φ = 851760.

The previous prime is 856649. The next prime is 856693. The reversal of 856673 is 376658.

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 61009 + 795664 = 247^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 856673 - 2⁸ = 856417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856693) 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, 2186 + ... + 2547.

It is an arithmetic number, because the mean of its divisors is an integer number (215397).

2⁸⁵⁶⁶⁷³ is an apocalyptic number.

It is an amenable number.

856673 is a deficient number, since it is larger than the sum of its proper divisors (4915).

856673 is a wasteful number, since it uses less digits than its factorization.

856673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4914.

The product of its digits is 30240, while the sum is 35.

The square root of 856673 is about 925.5663131294. The cubic root of 856673 is about 94.9740649425.

The spelling of 856673 in words is "eight hundred fifty-six thousand, six hundred seventy-three".