Well I've never had anything published myself, so I'm probably not the best person to ask...
It depends on a lot of things though: Genre, country, target audience...
A general science fiction novel comes in around 120,000 words. Fantasy are 130,000 at least. From what I understand.
My first draft of my own novel was 75,000 words and I was informed it was too short. It's now 126,000. Still hasn't helped me to secure a publisher or agent though...
