8210729 has 2 divisors, whose sum is σ = 8210730. Its totient is φ = 8210728.

The previous prime is 8210723. The next prime is 8210749. The reversal of 8210729 is 9270128.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7645225 + 565504 = 2765^2 + 752^2 .

It is a cyclic number.

It is not a de Polignac number, because 8210729 - 2¹² = 8206633 is a prime.

It is a super-2 number, since 2×8210729² = 134832141422882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8210723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4105364 + 4105365.

It is an arithmetic number, because the mean of its divisors is an integer number (4105365).

Almost surely, 2^8210729 is an apocalyptic number.

It is an amenable number.

8210729 is a deficient number, since it is larger than the sum of its proper divisors (1).

8210729 is an equidigital number, since it uses as much as digits as its factorization.

8210729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 8210729 is about 2865.4369649322. The cubic root of 8210729 is about 201.7408777565.

The spelling of 8210729 in words is "eight million, two hundred ten thousand, seven hundred twenty-nine".