The sum of the first two digits and the last three digits of this five-digit number is equal to 434: the third digit is 4.
Let this number be 1a4bc.
1a4+bc= 155, which means a *10+b *10+c = 51.
1a+4bc=434, which means a+b* 10+c=24.
Then a=3 b* 10+c=2 1.
b=2 c= 1
So this number is 1342 1.