856947293 has 2 divisors, whose sum is σ = 856947294. Its totient is φ = 856947292.

The previous prime is 856947251. The next prime is 856947323. The reversal of 856947293 is 392749658.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 843205444 + 13741849 = 29038^2 + 3707^2 .

It is a cyclic number.

It is not a de Polignac number, because 856947293 - 2⁸ = 856947037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856947233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428473646 + 428473647.

It is an arithmetic number, because the mean of its divisors is an integer number (428473647).

Almost surely, 2^856947293 is an apocalyptic number.

It is an amenable number.

856947293 is a deficient number, since it is larger than the sum of its proper divisors (1).

856947293 is an equidigital number, since it uses as much as digits as its factorization.

856947293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 53.

The square root of 856947293 is about 29273.6621043559. The cubic root of 856947293 is about 949.8420025333.

The spelling of 856947293 in words is "eight hundred fifty-six million, nine hundred forty-seven thousand, two hundred ninety-three".