javascript エラー「Uncaught TypeError: xxx.replace is not a function」の解決方法

const num = 123456;

const result = num.replace( /\d/g, '*' ); // ← エラーが発生

console.log( result );

Uncaught TypeError: num.replace is not a function

Uncaught TypeError: num.replace is not a function

TypeError: num.replace is not a function. (In 'num.replace( /\d/g, '*' )', 'num.replace' is undefined)

const arr = ['A11', 111, '222'];

const result = arr.map(function (v) {
  return v.replace( /\d/g, '*' );;
});
// Uncaught TypeError: v.replace is not a function

console.log( result );

const num = 123456;

const result = num.toString().replace( /\d/g, '*' );

console.log( result ); // ******

const num = 123456;

const result = typeof num === 'string' ? num.replace(/\d/g) : '文字列ではありません';

console.log( result ); // 文字列ではありません