Here is the NPR article that I remember. It is about people who associate musical notes with color. Many famous composers actually "see" the music that they compose.
http://www.npr.org/templates/story/story.php?storyId=4602748

Here is another interesting one:
http://psyche.cs.monash.edu.au/v2/psyche-2-10-cytowic.html

And as far as numbers having gender, this is the only thing I can find. But it talks about numbers as having personalities as well as genders (Ordinal linguistic personification):
http://en.wikipedia.org/wiki/Ordinal_linguistic_personification

I'm not quite sure that is what you are talking about, though. Anyone else want to chime in here? I feel like I'm having an interesting conversation with myself!


Mom to DS12 and DD3