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Convert NSNumber to NSString with NSNumberFormatter
NSNumber  *firstNumber = [tempDict objectForKey:@"theindex"];
NSString *convertNumber = [firstNumber stringValue];

NSNumber *firstNumber = [NSNumber numberWithInt:123456789];
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
NSString *convertNumber = [formatter stringForObjectValue:firstNumber];
NSLog(@"value : %@", convertNumber);

NSNumber  *firstNumber = [[NSNumber alloc] initWithInt:1000000] ;
 NSNumberFormatter *format=[[NSNumberFormatter alloc] init];
 [format setGroupingSize:3];
 [format setCurrencyGroupingSeparator:@","];
 [format setNumberStyle:NSNumberFormatterDecimalStyle];
 NSString *convertNumber = [format stringFromNumber:firstNumber];