856109982 has 128 divisors (see below), whose sum is σ = 2186440704. Its totient is φ = 217479168.

The previous prime is 856109963. The next prime is 856109993. The reversal of 856109982 is 289901658.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1873098 + ... + 1873554.

It is an arithmetic number, because the mean of its divisors is an integer number (17081568).

Almost surely, 2^856109982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856109982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093220352).

856109982 is an abundant number, since it is smaller than the sum of its proper divisors (1330330722).

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

856109982 is a wasteful number, since it uses less digits than its factorization.

856109982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 856109982 is about 29259.3571699721. The cubic root of 856109982 is about 949.5325426890.

The spelling of 856109982 in words is "eight hundred fifty-six million, one hundred nine thousand, nine hundred eighty-two".