856306873 has 4 divisors (see below), whose sum is σ = 879450340. Its totient is φ = 833163408.

The previous prime is 856306819. The next prime is 856306897. The reversal of 856306873 is 378603658.

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 555214969 + 301091904 = 23563^2 + 17352^2 .

It is a cyclic number.

It is not a de Polignac number, because 856306873 - 2²¹ = 854209721 is a prime.

It is a super-2 number, since 2×856306873² = 1466522921494076258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856306973) 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, 11571678 + ... + 11571751.

It is an arithmetic number, because the mean of its divisors is an integer number (219862585).

Almost surely, 2^856306873 is an apocalyptic number.

It is an amenable number.

856306873 is a deficient number, since it is larger than the sum of its proper divisors (23143467).

856306873 is a wasteful number, since it uses less digits than its factorization.

856306873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23143466.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 856306873 is about 29262.7215583240. The cubic root of 856306873 is about 949.6053293191.

The spelling of 856306873 in words is "eight hundred fifty-six million, three hundred six thousand, eight hundred seventy-three".