709689 has 4 divisors (see below), whose sum is σ = 946256. Its totient is φ = 473124.

The previous prime is 709679. The next prime is 709691. The reversal of 709689 is 986907.

709689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 709689 - 2⁴ = 709673 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (709609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118279 + ... + 118284.

It is an arithmetic number, because the mean of its divisors is an integer number (236564).

2⁷⁰⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

709689 is a deficient number, since it is larger than the sum of its proper divisors (236567).

709689 is a wasteful number, since it uses less digits than its factorization.

709689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236566.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 709689 is about 842.4304125564. The cubic root of 709689 is about 89.1981864673.

The spelling of 709689 in words is "seven hundred nine thousand, six hundred eighty-nine".