Character Analyzing

Is it possible to analyze separate characters in a string or numbers in an integer/float/etc similar to slicing in Python. Any help would be appreciated.
For strings, you can use the index operator.
With str[0] you can access the first character, with str[1] the second one and so on.

To do the same with numbers it might be helpful to convert it to a string first.
Maybe this is a dumb question...

But how do you go about converting an integer to a string?
Thanks.
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