856372687 has 2 divisors, whose sum is σ = 856372688. Its totient is φ = 856372686.

The previous prime is 856372661. The next prime is 856372703. The reversal of 856372687 is 786273658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856372687 - 2¹¹ = 856370639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856372487) 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 as a sum of consecutive naturals, namely, 428186343 + 428186344.

It is an arithmetic number, because the mean of its divisors is an integer number (428186344).

Almost surely, 2^856372687 is an apocalyptic number.

856372687 is a deficient number, since it is larger than the sum of its proper divisors (1).

856372687 is an equidigital number, since it uses as much as digits as its factorization.

856372687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 52.

The square root of 856372687 is about 29263.8460732693. The cubic root of 856372687 is about 949.6296569389.

The spelling of 856372687 in words is "eight hundred fifty-six million, three hundred seventy-two thousand, six hundred eighty-seven".