856573 has 4 divisors (see below), whose sum is σ = 886140. Its totient is φ = 827008.

The previous prime is 856571. The next prime is 856627. The reversal of 856573 is 375658.

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 145924 + 710649 = 382^2 + 843^2 .

It is a cyclic number.

It is not a de Polignac number, because 856573 - 2¹ = 856571 is a prime.

It is a Duffinian number.

856573 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856571) 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, 14740 + ... + 14797.

It is an arithmetic number, because the mean of its divisors is an integer number (221535).

2⁸⁵⁶⁵⁷³ is an apocalyptic number.

It is an amenable number.

856573 is a deficient number, since it is larger than the sum of its proper divisors (29567).

856573 is a wasteful number, since it uses less digits than its factorization.

856573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29566.

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

The square root of 856573 is about 925.5122905721. The cubic root of 856573 is about 94.9703693371.

The spelling of 856573 in words is "eight hundred fifty-six thousand, five hundred seventy-three".