856791906 has 32 divisors (see below), whose sum is σ = 1836425088. Its totient is φ = 265795200.

The previous prime is 856791853. The next prime is 856791937. The reversal of 856791906 is 609197658.

It is a super-2 number, since 2×856791906² = 1468184740374225672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78795 + ... + 89006.

It is an arithmetic number, because the mean of its divisors is an integer number (57388284).

Almost surely, 2^856791906 is an apocalyptic number.

856791906 is an abundant number, since it is smaller than the sum of its proper divisors (979633182).

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

856791906 is a wasteful number, since it uses less digits than its factorization.

856791906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167866.

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 856791906 is about 29271.0079430142. The cubic root of 856791906 is about 949.7845886479.

The spelling of 856791906 in words is "eight hundred fifty-six million, seven hundred ninety-one thousand, nine hundred six".