856424073 has 16 divisors (see below), whose sum is σ = 1180380672. Its totient is φ = 551760000.

The previous prime is 856424071. The next prime is 856424087. The reversal of 856424073 is 370424658.

It is a happy number.

It is not a de Polignac number, because 856424073 - 2¹ = 856424071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856424071) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 64723 + ... + 76823.

It is an arithmetic number, because the mean of its divisors is an integer number (73773792).

Almost surely, 2^856424073 is an apocalyptic number.

It is an amenable number.

856424073 is a deficient number, since it is larger than the sum of its proper divisors (323956599).

856424073 is a wasteful number, since it uses less digits than its factorization.

856424073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12896.

The product of its (nonzero) digits is 161280, while the sum is 39.

The square root of 856424073 is about 29264.7240376533. The cubic root of 856424073 is about 949.6486504971.

The spelling of 856424073 in words is "eight hundred fifty-six million, four hundred twenty-four thousand, seventy-three".