The length of a number in JavaScript can be calculated by converting the number to a string and then finding the length of that string. Here’s an example of a function that calculates the length of a number:

```
function numberLength(num) {
return num.toString().length;
}
const result = numberLength(123456);
console.log(result); // 6
```

In this example, the `toString`

method is used to convert the number `num`

to a string, and then the `length`

property is used to find the length of the string. The result of the function is the length of the number.

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