Generate consecutive number as title using auto_nodetitle?
If you haven't installed Token module, do so. 

From there, you can insert the token [node:nid] into the auto title field. If you don't want to use the nid, you can install the Serial field module, add a field to the content type, and insert that into the title via [node:field_machine_name]. For most purposes, nid should suffice. 

You can browse &amp; insert token values via the supplied token browser ui.