How to recurse a given number from left to right?

Question

Python

Given a natural number N. Print all its digits one at a time, in the usual
order, separating them with spaces or newlines. When solving this
problem, you cannot use strings, lists, arrays (well, and cycles, of
course). Only recursion and integer arithmetic are allowed.

Answer 1

def p(k):
  if k < 10:
    return str(k)
  else:
    return p(k//10) + str(k%10)

p(142857)