8168729 has 2 divisors, whose sum is σ = 8168730. Its totient is φ = 8168728.

The previous prime is 8168683. The next prime is 8168791. The reversal of 8168729 is 9278618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5053504 + 3115225 = 2248^2 + 1765^2 .

It is a cyclic number.

It is not a de Polignac number, because 8168729 - 2²⁰ = 7120153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8168429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4084364 + 4084365.

It is an arithmetic number, because the mean of its divisors is an integer number (4084365).

Almost surely, 2^8168729 is an apocalyptic number.

It is an amenable number.

8168729 is a deficient number, since it is larger than the sum of its proper divisors (1).

8168729 is an equidigital number, since it uses as much as digits as its factorization.

8168729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 8168729 is about 2858.0988436371. The cubic root of 8168729 is about 201.3963039898.

The spelling of 8168729 in words is "eight million, one hundred sixty-eight thousand, seven hundred twenty-nine".