851800 has 24 divisors (see below), whose sum is σ = 1980900. Its totient is φ = 340640.

The previous prime is 851797. The next prime is 851801. The reversal of 851800 is 8158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1930 + ... + 2329.

2⁸⁵¹⁸⁰⁰ is an apocalyptic number.

It is an amenable number.

851800 is an abundant number, since it is smaller than the sum of its proper divisors (1129100).

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

851800 is a wasteful number, since it uses less digits than its factorization.

851800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4275 (or 4266 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 851800 is about 922.9301165310. The cubic root of 851800 is about 94.7936425677.

Adding to 851800 its reverse (8158), we get a palindrome (859958).

The spelling of 851800 in words is "eight hundred fifty-one thousand, eight hundred".