856064438 has 4 divisors (see below), whose sum is σ = 1284096660. Its totient is φ = 428032218.

The previous prime is 856064401. The next prime is 856064441. The reversal of 856064438 is 834460658.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 214016108 + ... + 214016111.

It is an arithmetic number, because the mean of its divisors is an integer number (321024165).

Almost surely, 2^856064438 is an apocalyptic number.

856064438 is a deficient number, since it is larger than the sum of its proper divisors (428032222).

856064438 is a wasteful number, since it uses less digits than its factorization.

856064438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428032221.

The product of its (nonzero) digits is 552960, while the sum is 44.

The square root of 856064438 is about 29258.5788786810. The cubic root of 856064438 is about 949.5157044019.

The spelling of 856064438 in words is "eight hundred fifty-six million, sixty-four thousand, four hundred thirty-eight".