The digits product of two digit has number four
2000 - not including the number 3000.
Any number that ends with 5 or 0 except 0 itself is divisble by 5
Four of them.
How many four digit combinations can be made from the number nine? Example, 1+1+2+5=9.
There are 9 x 10 x 10 x 10, or 9000 four-digit number that can be formed if the leading digit cannot be zero.
The number is a 13-digit number.
There is 90 four digit palindromes.