856420 has 12 divisors (see below), whose sum is σ = 1798524. Its totient is φ = 342560.

The previous prime is 856417. The next prime is 856421. The reversal of 856420 is 24658.

It can be written as a sum of positive squares in 2 ways, for example, as 147456 + 708964 = 384^2 + 842^2 .

It is not an unprimeable number, because it can be changed into a prime (856421) 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, 21391 + ... + 21430.

It is an arithmetic number, because the mean of its divisors is an integer number (149877).

2⁸⁵⁶⁴²⁰ is an apocalyptic number.

It is an amenable number.

856420 is an abundant number, since it is smaller than the sum of its proper divisors (942104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

856420 is a wasteful number, since it uses less digits than its factorization.

856420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42830 (or 42828 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 856420 is about 925.4296299557. The cubic root of 856420 is about 94.9647145042.

The spelling of 856420 in words is "eight hundred fifty-six thousand, four hundred twenty".