859921 has 4 divisors (see below), whose sum is σ = 905200. Its totient is φ = 814644.

The previous prime is 859919. The next prime is 859927. The reversal of 859921 is 129958.

859921 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 859921 - 2¹ = 859919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (859927) 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, 22611 + ... + 22648.

It is an arithmetic number, because the mean of its divisors is an integer number (226300).

2⁸⁵⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

859921 is a deficient number, since it is larger than the sum of its proper divisors (45279).

859921 is a wasteful number, since it uses less digits than its factorization.

859921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45278.

The product of its digits is 6480, while the sum is 34.

The square root of 859921 is about 927.3192546259. The cubic root of 859921 is about 95.0939421610.

The spelling of 859921 in words is "eight hundred fifty-nine thousand, nine hundred twenty-one".