Call a positive integer complete if it uses every digit from 1 to 9 once. Examples of complete numbers are 192837465, 987654321 and 491857263.

What is the sum of all complete numbers?

The answer is 201599999798400.

**
This section requires Javascript.
**

You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.

Each digit appears in each column $8!=40320$ times.

So each column must add up to $40320(1+2+3+4+5+6+7+8+9)=181400$

Therefore, the sum of all complete numbers is

$sum=1814400(1+10+100+1000+10000+100000+1000000+10000000+100000000)=$ $\large \color{#D61F06}\boxed{201599999798400}$