Nested Loops - Special numbers

function specialNumbers(args) {
    let specialNumb = Number(args[0]);
    let formatString = '';

    for (i = 1; i <= 9; i++) {
        for (j = 1; j <= 9; j++) {
            for (k = 1; k <= 9; k++) {
                for (l = 1; l <= 9; l++) {
                    if (specialNumb % i === 0 &&
                        specialNumb % j === 0 &&
                        specialNumb % k === 0 &&
                        specialNumb % l === 0) {
                        formatString += `${i}${j}${k}${l} `;
                    }
                }
            }
        }
    }
    console.log(formatString);
}