856465806 has 48 divisors (see below), whose sum is σ = 2012010624. Its totient is φ = 242320176.

The previous prime is 856465783. The next prime is 856465807. The reversal of 856465806 is 608564658.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856465807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16141 + ... + 44423.

It is an arithmetic number, because the mean of its divisors is an integer number (41916888).

Almost surely, 2^856465806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856465806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006005312).

856465806 is an abundant number, since it is smaller than the sum of its proper divisors (1155544818).

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

856465806 is a wasteful number, since it uses less digits than its factorization.

856465806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28405 (or 28398 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The square root of 856465806 is about 29265.4370546554. The cubic root of 856465806 is about 949.6640755047.

The spelling of 856465806 in words is "eight hundred fifty-six million, four hundred sixty-five thousand, eight hundred six".