818856 has 64 divisors (see below), whose sum is σ = 2419200. Its totient is φ = 255744.

The previous prime is 818837. The next prime is 818887. The reversal of 818856 is 658818.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 818856.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 818856.

It is an unprimeable number.

818856 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 15 ways as a sum of consecutive naturals, for example, 3561 + ... + 3783.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2⁸¹⁸⁸⁵⁶ 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 818856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1209600).

818856 is an abundant number, since it is smaller than the sum of its proper divisors (1600344).

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

818856 is a wasteful number, since it uses less digits than its factorization.

818856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 245 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 818856 is about 904.9066250172. The cubic root of 818856 is about 93.5554686263. Note that the first 3 decimals are identical.

The spelling of 818856 in words is "eight hundred eighteen thousand, eight hundred fifty-six".