The apps allow you to calculate following types of numbers :
- Amicable number
- Automorphic number
- Armstrong number
- Circular Prime number
- Desarium number
- Fascinating number
- Fibonacci number
- FibPrime number
- Happy number
- Kaprekar number
- Magic number
- Mersenne number
- Neon number
- Niven number
- Pallindrome number
- Perfect number
- Prime number
- Prime Pallindrome number
- Pronic number
- Random number
- Special number
- Tech number
- Triangular number

All the above numbers can be calculated in a range or a particular number can be checked.

The underlying Java code is available with just a flick of switch at the top right corner of the app.