JSFiddle - React, Tailwind, and code Playground

JavaScript

function nextBigger(num){
	let numStr = '' + num;
  let numArr = [];

  for(let i = 0; i < numStr.length; ++i) {
  	numArr.push(numStr[i]);
  }

  console.log(numArr);
}

nextBigger(513);