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the mystery number

between 1000 to 9999 only a single number(1729) satisfies both two properties. here is a 'C' Program to find the number.

#include
#include

main()
{
long x,y,rem,sum,sum1,t,rev,div,flag;

for (x=100;x<=99999;x++)
{
t=x;sum=0;
while(t>0)
{
rem=t%10;
sum=sum+rem;
t=t/10;
}
y=sum;rev=0;
while(sum>0)
{
rev=rev*10+(sum%10);
sum=sum/10;
}
if(x==y*rev)
{
rev=0;sum=x;
while(sum>0)
{
rev=rev*10+(sum%10);
sum=sum/10;
}
div=2;sum1=1;flag=0;
while(rev>1)
{
if(rev%div==0)
{
rev=rev/div;
if(flag==0){
sum1=sum1+(div*div);flag++;}
}
else
{
div=div+1;
flag=0;
}
}
sum1=sum1/2;
printf("x=%d lastno=%d\n",x,sum1);
}
}
getch();

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