let numValue=100;                   //primitive number
let numObject = new Number(1500);   //Number object
 
numValue=numObject;       //Compile Error 
numObject=numValue;       //ok
 
 
***** Error *****
Type 'Number' is not assignable to type 'number'.
  'number' is a primitive, but 'Number' is a wrapper object. Prefer using 'number' when possible.ts(2322)