How to convert hashed result into readable format?

I’m trying to convert a hashed block number “30054a” into readable format but I’m getting logs something like this:

0J

For another hashed value:

Y����#�(�J�d��F,ĦJ/

I’m using the following code on my NodeJS server:

const util = require(‘ethjs-util’);
const value = util.toAscii(‘30054a’);
console.log(value);

I had even tried toUtf8. I’m using ethjs library.

Where am I wrong?