705689 has 2 divisors, whose sum is σ = 705690. Its totient is φ = 705688.

The previous prime is 705643. The next prime is 705713. The reversal of 705689 is 986507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 697225 + 8464 = 835^2 + 92^2 .

It is an emirp because it is prime and its reverse (986507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 705689 - 2¹² = 701593 is a prime.

It is not a weakly prime, because it can be changed into another prime (705389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352844 + 352845.

It is an arithmetic number, because the mean of its divisors is an integer number (352845).

2⁷⁰⁵⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

705689 is a deficient number, since it is larger than the sum of its proper divisors (1).

705689 is an equidigital number, since it uses as much as digits as its factorization.

705689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 705689 is about 840.0529745201. The cubic root of 705689 is about 89.0302888954.

The spelling of 705689 in words is "seven hundred five thousand, six hundred eighty-nine".