856207829 has 2 divisors, whose sum is σ = 856207830. Its totient is φ = 856207828.

The previous prime is 856207801. The next prime is 856207841. The reversal of 856207829 is 928702658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 669256900 + 186950929 = 25870^2 + 13673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856207829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856207889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428103914 + 428103915.

It is an arithmetic number, because the mean of its divisors is an integer number (428103915).

Almost surely, 2^856207829 is an apocalyptic number.

It is an amenable number.

856207829 is a deficient number, since it is larger than the sum of its proper divisors (1).

856207829 is an equidigital number, since it uses as much as digits as its factorization.

856207829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 856207829 is about 29261.0291855909. The cubic root of 856207829 is about 949.5687161454.

The spelling of 856207829 in words is "eight hundred fifty-six million, two hundred seven thousand, eight hundred twenty-nine".