856354785 has 64 divisors (see below), whose sum is σ = 1632669696. Its totient is φ = 377798400.

The previous prime is 856354771. The next prime is 856354799. The reversal of 856354785 is 587453658.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (856354771) and next prime (856354799).

It is not a de Polignac number, because 856354785 - 2⁴ = 856354769 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149484 + ... + 155106.

It is an arithmetic number, because the mean of its divisors is an integer number (25510464).

Almost surely, 2^856354785 is an apocalyptic number.

It is an amenable number.

856354785 is a deficient number, since it is larger than the sum of its proper divisors (776314911).

856354785 is a wasteful number, since it uses less digits than its factorization.

856354785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5726.

The product of its digits is 4032000, while the sum is 51.

The square root of 856354785 is about 29263.5401993675. The cubic root of 856354785 is about 949.6230397309.

The spelling of 856354785 in words is "eight hundred fifty-six million, three hundred fifty-four thousand, seven hundred eighty-five".