Did Sauron take the ring with him to Numenor

[pandora]

He could have left the Ring at Barad-dur, where the Nazgul could be trusted with such security, quite effectively. He sent them to hunt down the Ring in the FoTR, because he trusted them in just this way

He could control them. "Trust" had nothing to do with it.

What troubles me with this question: Is did he really use it to seduce the Numenoreans?

Indirectly: since much of his (spiritual?) strength was invested in the ring (in order to be able to control the other rings), without it being to hand he would have had a much harder time bending the strong-willed Numenorians to his ends.