689709 has 4 divisors (see below), whose sum is σ = 919616. Its totient is φ = 459804.

The previous prime is 689699. The next prime is 689713. The reversal of 689709 is 907986.

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 689709 - 2⁴ = 689693 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689779) 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, 114949 + ... + 114954.

It is an arithmetic number, because the mean of its divisors is an integer number (229904).

2⁶⁸⁹⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

689709 is a deficient number, since it is larger than the sum of its proper divisors (229907).

689709 is a wasteful number, since it uses less digits than its factorization.

689709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229906.

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

The square root of 689709 is about 830.4872064036. The cubic root of 689709 is about 88.3531350726.

The spelling of 689709 in words is "six hundred eighty-nine thousand, seven hundred nine".