859221108 has 60 divisors (see below), whose sum is σ = 2259304740. Its totient is φ = 284732928.

The previous prime is 859221061. The next prime is 859221127. The reversal of 859221108 is 801122958.

It can be written as a sum of positive squares in 2 ways, for example, as 431475984 + 427745124 = 20772^2 + 20682^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48388 + ... + 63716.

It is an arithmetic number, because the mean of its divisors is an integer number (37655079).

Almost surely, 2^859221108 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 859221108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129652370).

859221108 is an abundant number, since it is smaller than the sum of its proper divisors (1400083632).

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

859221108 is a wasteful number, since it uses less digits than its factorization.

859221108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15518 (or 15507 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 859221108 is about 29312.4735906064. The cubic root of 859221108 is about 950.6813608730.

It can be divided in two parts, 859221 and 108, that added together give a square (859329 = 927²).

The spelling of 859221108 in words is "eight hundred fifty-nine million, two hundred twenty-one thousand, one hundred eight".