Question

Find the smallest +ve mathematical number which is spelled in an alphabetical order ?

Answer 1

its forty.

how can you do it manually 


zero                    // starts with "z" :P , no luck here
 one - ten           // nothing 
eleven - twenty // nothing

// now every number which is like 21 , 22, 23 cant be the answer as one - nine is already checked

so check 30,40,so on 

you get forty

you go till ninety only

as after 100 
everything will repeat 

till thousand 
so you check thousand // nope
// million // nope
and so on ..

as you say smallest -- you can consider negative 

-1   ->   minus one 

minus is not alphabetically spelled so all negative numbers are out of picture

// i hope i did not miss something in between
// also depend on language we write in // for this answer its english