856240237 has 2 divisors, whose sum is σ = 856240238. Its totient is φ = 856240236.

The previous prime is 856240193. The next prime is 856240247. The reversal of 856240237 is 732042658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674233156 + 182007081 = 25966^2 + 13491^2 .

It is a cyclic number.

It is not a de Polignac number, because 856240237 - 2¹¹ = 856238189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 856240196 and 856240205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856240247) 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 as a sum of consecutive naturals, namely, 428120118 + 428120119.

It is an arithmetic number, because the mean of its divisors is an integer number (428120119).

Almost surely, 2^856240237 is an apocalyptic number.

It is an amenable number.

856240237 is a deficient number, since it is larger than the sum of its proper divisors (1).

856240237 is an equidigital number, since it uses as much as digits as its factorization.

856240237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 856240237 is about 29261.5829544473. The cubic root of 856240237 is about 949.5806965835.

The spelling of 856240237 in words is "eight hundred fifty-six million, two hundred forty thousand, two hundred thirty-seven".