850820 has 24 divisors (see below), whose sum is σ = 1881600. Its totient is φ = 322272.

The previous prime is 850807. The next prime is 850823. The reversal of 850820 is 28058.

It is not an unprimeable number, because it can be changed into a prime (850823) by changing a digit.

850820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740 + ... + 1499.

It is an arithmetic number, because the mean of its divisors is an integer number (78400).

2⁸⁵⁰⁸²⁰ is an apocalyptic number.

It is an amenable number.

850820 is an abundant number, since it is smaller than the sum of its proper divisors (1030780).

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

850820 is a wasteful number, since it uses less digits than its factorization.

850820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267 (or 2265 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 850820 is about 922.3990459665. The cubic root of 850820 is about 94.7572751032.

Adding to 850820 its reverse (28058), we get a palindrome (878878).

The spelling of 850820 in words is "eight hundred fifty thousand, eight hundred twenty".