859721 has 4 divisors (see below), whose sum is σ = 871572. Its totient is φ = 847872.

The previous prime is 859709. The next prime is 859751. The reversal of 859721 is 127958.

859721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 546121 + 313600 = 739^2 + 560^2 .

It is a cyclic number.

It is not a de Polignac number, because 859721 - 2⁶ = 859657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (859751) 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, 5816 + ... + 5961.

It is an arithmetic number, because the mean of its divisors is an integer number (217893).

2⁸⁵⁹⁷²¹ is an apocalyptic number.

It is an amenable number.

859721 is a deficient number, since it is larger than the sum of its proper divisors (11851).

859721 is a wasteful number, since it uses less digits than its factorization.

859721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11850.

The product of its digits is 5040, while the sum is 32.

The square root of 859721 is about 927.2114106287. The cubic root of 859721 is about 95.0865692887.

The spelling of 859721 in words is "eight hundred fifty-nine thousand, seven hundred twenty-one".