850840 has 32 divisors (see below), whose sum is σ = 1944000. Its totient is φ = 335104.

The previous prime is 850823. The next prime is 850849. The reversal of 850840 is 48058.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (850849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3441 + ... + 3679.

It is an arithmetic number, because the mean of its divisors is an integer number (60750).

2⁸⁵⁰⁸⁴⁰ 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 850840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972000).

850840 is an abundant number, since it is smaller than the sum of its proper divisors (1093160).

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

850840 is a wasteful number, since it uses less digits than its factorization.

850840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 850840 is about 922.4098871977. The cubic root of 850840 is about 94.7580175754.

Adding to 850840 its reverse (48058), we get a palindrome (898898).

The spelling of 850840 in words is "eight hundred fifty thousand, eight hundred forty".