check NaN number
57494
Checking if a double (or float) is NaN in C++
63076
How to read numbers in English
96827
What is the C# equivalent of NaN or IsNumeric?
156560
Why is NaN not equal to NaN?
11029
Display number with leading zeros
96317
How to check type of variable in Java?
106634
Check if a value from scanf is a number?
83165
What is the rationale for all comparisons returning false for IEEE754 NaN values?
27583
Determine if object is integer
139442
How can i count number of digits in tetrated numbers?
59343
Check whether an input string contains a number in javascript
6282
How do I check if a string is a number (float)?
42559
(Built-in) way in JavaScript to check if a string is a valid number
49987
Gets last digit of a number
3864
How to find length of digits in an integer?
36098
Checking for valid floating point number
32883
Convert number to list of digits