855828 has 18 divisors (see below), whose sum is σ = 2163434. Its totient is φ = 285264.

The previous prime is 855821. The next prime is 855851. The reversal of 855828 is 828558.

It can be written as a sum of positive squares in only one way, i.e., 636804 + 219024 = 798^2 + 468^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 23773 = 855828 / (8 + 5 + 5 + 8 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 855792 and 855801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855821) by changing a digit.

855828 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11851 + ... + 11922.

2⁸⁵⁵⁸²⁸ is an apocalyptic number.

It is an amenable number.

855828 is an abundant number, since it is smaller than the sum of its proper divisors (1307606).

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

855828 is a wasteful number, since it uses less digits than its factorization.

855828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23783 (or 23778 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 855828 is about 925.1097232221. The cubic root of 855828 is about 94.9428280194.

The spelling of 855828 in words is "eight hundred fifty-five thousand, eight hundred twenty-eight".