856193321 has 16 divisors (see below), whose sum is σ = 915033600. Its totient is φ = 798336000.

The previous prime is 856193311. The next prime is 856193347. The reversal of 856193321 is 123391658.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856193321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856193311) 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 15 ways as a sum of consecutive naturals, for example, 1139696 + ... + 1140446.

It is an arithmetic number, because the mean of its divisors is an integer number (57189600).

Almost surely, 2^856193321 is an apocalyptic number.

It is an amenable number.

856193321 is a deficient number, since it is larger than the sum of its proper divisors (58840279).

856193321 is a wasteful number, since it uses less digits than its factorization.

856193321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304.

The product of its digits is 38880, while the sum is 38.

The square root of 856193321 is about 29260.7812780179. The cubic root of 856193321 is about 949.5633527978.

The spelling of 856193321 in words is "eight hundred fifty-six million, one hundred ninety-three thousand, three hundred twenty-one".