8705689 has 2 divisors, whose sum is σ = 8705690. Its totient is φ = 8705688.

The previous prime is 8705681. The next prime is 8705729. The reversal of 8705689 is 9865078.

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., 6553600 + 2152089 = 2560^2 + 1467^2 .

It is a cyclic number.

It is not a de Polignac number, because 8705689 - 2³ = 8705681 is a prime.

8705689 is a lucky number.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (8705681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4352844 + 4352845.

It is an arithmetic number, because the mean of its divisors is an integer number (4352845).

Almost surely, 2^8705689 is an apocalyptic number.

It is an amenable number.

8705689 is a deficient number, since it is larger than the sum of its proper divisors (1).

8705689 is an equidigital number, since it uses as much as digits as its factorization.

8705689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 8705689 is about 2950.5404589668. The cubic root of 8705689 is about 205.7158318290.

The spelling of 8705689 in words is "eight million, seven hundred five thousand, six hundred eighty-nine".