856005387 has 16 divisors (see below), whose sum is σ = 1184762880. Its totient is φ = 549165600.

The previous prime is 856005377. The next prime is 856005391. The reversal of 856005387 is 783500658.

It is not a de Polignac number, because 856005387 - 2²⁰ = 854956811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856005377) 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, 9064 + ... + 42357.

It is an arithmetic number, because the mean of its divisors is an integer number (74047680).

Almost surely, 2^856005387 is an apocalyptic number.

856005387 is a deficient number, since it is larger than the sum of its proper divisors (328757493).

856005387 is a wasteful number, since it uses less digits than its factorization.

856005387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51634.

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 856005387 is about 29257.5697384455. The cubic root of 856005387 is about 949.4938714890.

The spelling of 856005387 in words is "eight hundred fifty-six million, five thousand, three hundred eighty-seven".