856530815 has 16 divisors (see below), whose sum is σ = 1177481280. Its totient is φ = 585930240.

The previous prime is 856530769. The next prime is 856530817. The reversal of 856530815 is 518035658.

It is not a de Polignac number, because 856530815 - 2¹² = 856526719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856530817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14330 + ... + 43799.

It is an arithmetic number, because the mean of its divisors is an integer number (73592580).

Almost surely, 2^856530815 is an apocalyptic number.

856530815 is a deficient number, since it is larger than the sum of its proper divisors (320950465).

856530815 is a wasteful number, since it uses less digits than its factorization.

856530815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58562.

The product of its (nonzero) digits is 144000, while the sum is 41.

The square root of 856530815 is about 29266.5477123627. The cubic root of 856530815 is about 949.6881025974.

The spelling of 856530815 in words is "eight hundred fifty-six million, five hundred thirty thousand, eight hundred fifteen".