856835747 has 4 divisors (see below), whose sum is σ = 860021280. Its totient is φ = 853650216.

The previous prime is 856835729. The next prime is 856835779. The reversal of 856835747 is 747538658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747538658 = 2 ⋅373769329.

It is a cyclic number.

It is not a de Polignac number, because 856835747 - 2¹⁸ = 856573603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856835797) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1592363 + ... + 1592900.

It is an arithmetic number, because the mean of its divisors is an integer number (215005320).

Almost surely, 2^856835747 is an apocalyptic number.

856835747 is a deficient number, since it is larger than the sum of its proper divisors (3185533).

856835747 is a wasteful number, since it uses less digits than its factorization.

856835747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3185532.

The product of its digits is 5644800, while the sum is 53.

The square root of 856835747 is about 29271.7568143766. The cubic root of 856835747 is about 949.8007881458.

The spelling of 856835747 in words is "eight hundred fifty-six million, eight hundred thirty-five thousand, seven hundred forty-seven".