855800 has 48 divisors (see below), whose sum is σ = 2176200. Its totient is φ = 310400.

The previous prime is 855787. The next prime is 855821. The reversal of 855800 is 8558.

It is a self number, because there is not a number n which added to its sum of digits gives 855800.

It is a congruent number.

It is an unprimeable 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 11 ways as a sum of consecutive naturals, for example, 2006 + ... + 2394.

2⁸⁵⁵⁸⁰⁰ 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 855800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088100).

855800 is an abundant number, since it is smaller than the sum of its proper divisors (1320400).

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

855800 is a wasteful number, since it uses less digits than its factorization.

855800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 855800 is about 925.0945897583. The cubic root of 855800 is about 94.9417925979.

Multiplying 855800 by its reverse (8558), we get a square (7323936400 = 85580²).

855800 divided by its reverse (8558) gives a square (100 = 10²).

It can be divided in two parts, 85 and 5800, that added together give a palindrome (5885).

The spelling of 855800 in words is "eight hundred fifty-five thousand, eight hundred".