JSFiddle - React, Tailwind, and code Playground

HTML

<input class="myInput" style="width: 100px!important" type="number"  step="5000" value="0" min="0" max="99999999" />

JavaScript

$('.myInput').on('blur', function() {
    var amount = $('.myInput').val().replace(/^\s+|\s+$/g, '');
    if( ($('.myInput').val() != '') && (!amount.match(/^$/) )){
        $('.myInput').val( parseInt(amount).toFixed(3));
    }
});