Count Up Animation

count_up.js

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

<script>
  
$('.counter').each(function() {
  var $this = $(this),
      countTo = $this.attr('data-count');
  
  $({ countNum: $this.text()}).animate({
    countNum: countTo
  },

  {
    duration: 8000,
    easing:'linear',
    step: function() {
      $this.text(Math.floor(this.countNum));
    },
    complete: function() {
      $this.text(this.countNum);
      //alert('finished');
    }
  });  
});
/**
    * Do not remove this section; it allows our team to troubleshoot and track feature adoption. 
    * TS:0002-03-041
*/
</script>

how can I divide numbers like 3,459,069 ??