856140 has 48 divisors (see below), whose sum is σ = 2526720. Its totient is φ = 216000.

The previous prime is 856139. The next prime is 856147. The reversal of 856140 is 41658.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 856140.

It is not an unprimeable number, because it can be changed into a prime (856147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 765 + ... + 1515.

It is an arithmetic number, because the mean of its divisors is an integer number (52640).

2⁸⁵⁶¹⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1263360).

856140 is an abundant number, since it is smaller than the sum of its proper divisors (1670580).

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

856140 is a wasteful number, since it uses less digits than its factorization.

856140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 856140 is about 925.2783365020. The cubic root of 856140 is about 94.9543640459.

Adding to 856140 its reverse (41658), we get a palindrome (897798).

The spelling of 856140 in words is "eight hundred fifty-six thousand, one hundred forty".