689609 has 4 divisors (see below), whose sum is σ = 719616. Its totient is φ = 659604.

The previous prime is 689603. The next prime is 689621. The reversal of 689609 is 906986.

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 a cyclic number.

It is not a de Polignac number, because 689609 - 2¹² = 685513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689603) 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, 14969 + ... + 15014.

It is an arithmetic number, because the mean of its divisors is an integer number (179904).

2⁶⁸⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

689609 is a deficient number, since it is larger than the sum of its proper divisors (30007).

689609 is a wasteful number, since it uses less digits than its factorization.

689609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30006.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 689609 is about 830.4269985977. The cubic root of 689609 is about 88.3488647979.

The spelling of 689609 in words is "six hundred eighty-nine thousand, six hundred nine".