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Integer Type ------------ Integers are the only kind of number in GNU Emacs Lisp, version 18. The range of values for integers is -8388608 to 8388607 (24 bits; i.e., -2**23 to 2**23 - 1) on most machines, but is 25 or 26 bits on some systems. It is important to note that the Emacs Lisp arithmetic functions do not check for overflow. Thus `(1+ 8388607)' is -8388608 on 24-bit implementations. The read syntax for numbers is a sequence of (base ten) digits with an optional sign. The printed representation produced by the Lisp interpreter never has a leading `+'. -1 ; The integer -1. 1 ; The integer 1. +1 ; Also the integer 1. 16777217 ; Also the integer 1! ; (on a 24-bit or 25-bit implementation)Note:Numbers, for more information.