689447 has 8 divisors (see below), whose sum is σ = 758160. Its totient is φ = 621760.

The previous prime is 689441. The next prime is 689459. The reversal of 689447 is 744986.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 689447 - 2⁴ = 689431 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 689447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2429 + ... + 2697.

It is an arithmetic number, because the mean of its divisors is an integer number (94770).

2⁶⁸⁹⁴⁴⁷ is an apocalyptic number.

689447 is a deficient number, since it is larger than the sum of its proper divisors (68713).

689447 is a wasteful number, since it uses less digits than its factorization.

689447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513.

The product of its digits is 48384, while the sum is 38.

The square root of 689447 is about 830.3294526873. The cubic root of 689447 is about 88.3419460769.

The spelling of 689447 in words is "six hundred eighty-nine thousand, four hundred forty-seven".