It is important to note when you run these the number will reset so if you are tracking tickets / incidents by this number it can throw off some tracking systems.. especially if integrated with a third party ticketing systems. So if for example you are on like 208993 and then do an IRCLEAN these you will loose your numbering.. and this will likely mess with any other external ticketing if you do this.
I can confirm that the AUTOAN parameter of IRCLEAN does NOT reset this number too..but a 'partial' or 'full' DOES reset the number.
Note: That AIM/ATM Manager tickets are treated a bit differently and so while they are similar and are not cleaned by a 'Partial' or a 'Full'. You need to do a 'irclean aim' (dangerous) they blow away all tickets and I believe reset the number back to 1.
If my answer helped you today, please be sure to mark the resolved button to assist others.
Christopher R Souser - Solution Architect – MSci. PA, CISSP, ITIL.