856985539 has 8 divisors (see below), whose sum is σ = 867555360. Its totient is φ = 846436800.

The previous prime is 856985537. The next prime is 856985579. The reversal of 856985539 is 935589658.

856985539 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 not a de Polignac number, because 856985539 - 2¹ = 856985537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856985533) 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, 86154 + ... + 95584.

It is an arithmetic number, because the mean of its divisors is an integer number (108444420).

Almost surely, 2^856985539 is an apocalyptic number.

856985539 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

856985539 is a deficient number, since it is larger than the sum of its proper divisors (10569821).

856985539 is a wasteful number, since it uses less digits than its factorization.

856985539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10541.

The product of its digits is 11664000, while the sum is 58.

The square root of 856985539 is about 29274.3153463920. The cubic root of 856985539 is about 949.8561329693.

The spelling of 856985539 in words is "eight hundred fifty-six million, nine hundred eighty-five thousand, five hundred thirty-nine".