856459830 has 32 divisors (see below), whose sum is σ = 2176416864. Its totient is φ = 214954496.

The previous prime is 856459829. The next prime is 856459841. The reversal of 856459830 is 38954658.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 856459830.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 839157 + ... + 840176.

It is an arithmetic number, because the mean of its divisors is an integer number (68013027).

Almost surely, 2^856459830 is an apocalyptic number.

856459830 is an abundant number, since it is smaller than the sum of its proper divisors (1319957034).

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

856459830 is a wasteful number, since it uses less digits than its factorization.

856459830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679360.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The square root of 856459830 is about 29265.3349545157. The cubic root of 856459830 is about 949.6618667355.

The spelling of 856459830 in words is "eight hundred fifty-six million, four hundred fifty-nine thousand, eight hundred thirty".