856284893 has 2 divisors, whose sum is σ = 856284894. Its totient is φ = 856284892.

The previous prime is 856284887. The next prime is 856284901. The reversal of 856284893 is 398482658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682097689 + 174187204 = 26117^2 + 13198^2 .

It is a cyclic number.

It is not a de Polignac number, because 856284893 - 2¹² = 856280797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856284833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428142446 + 428142447.

It is an arithmetic number, because the mean of its divisors is an integer number (428142447).

Almost surely, 2^856284893 is an apocalyptic number.

It is an amenable number.

856284893 is a deficient number, since it is larger than the sum of its proper divisors (1).

856284893 is an equidigital number, since it uses as much as digits as its factorization.

856284893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 53.

The square root of 856284893 is about 29262.3459927600. The cubic root of 856284893 is about 949.5972043098.

The spelling of 856284893 in words is "eight hundred fifty-six million, two hundred eighty-four thousand, eight hundred ninety-three".