1*2*3*2*5*7*2*3=2520
2520*100000=252,000,000
Numbers that are co-prime won't both be divisible by nine.
Yes, it is. One way to tell if a number is divisible by nine is to add up all of the numbers until you get a one digit number, and if the number isn't nine, the number isn't divisible by nine. 4+8+6+0= 18 1+8=9
144 is divisible by 12 and 9.
144
108
900000
There are 278 5-digit numbers less than 20,000 that are divisible by both four and nine.
Any number whose digits do not add up to 9, 18 or 27. There are 800 of them!
987652431
900 It is the only three digit number with a nine in the numbers place
All multiples of nine, which is an infinite number.
A 4-digit number divisible by both 5 and 9 must be divisible by their least common multiple, which is 45. To find a 4-digit number divisible by 45, we need to find a number that ends in 0 and is divisible by 45. The smallest 4-digit number that fits these criteria is 1005 (45 x 22 = 990, and adding 15 gives us 1005).