856747 has 8 divisors (see below), whose sum is σ = 915840. Its totient is φ = 799680.

The previous prime is 856733. The next prime is 856759. The reversal of 856747 is 747658.

It is a happy number.

856747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856747 is a prime.

It is a d-powerful number, because it can be written as 8⁵ + 5³ + 7² + 6 + 4⁴ + 7⁷ .

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (114480).

2⁸⁵⁶⁷⁴⁷ is an apocalyptic number.

856747 is a deficient number, since it is larger than the sum of its proper divisors (59093).

856747 is a wasteful number, since it uses less digits than its factorization.

856747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013.

The product of its digits is 47040, while the sum is 37.

The square root of 856747 is about 925.6062877920. The cubic root of 856747 is about 94.9767995054.

The spelling of 856747 in words is "eight hundred fifty-six thousand, seven hundred forty-seven".