<?
$number = '14,500,400';
$tab = explode(",",$number);
$arrayNumber = array_reverse($tab);
if(intval($arrayNumber[0])!=0){
    $str[] = $arrayNumber[0] . ' hundreds';
}
if(intval($arrayNumber[1])!=0){
    $str[] = $arrayNumber[1] . ' thounsands';
}
if(intval($arrayNumber[2])!=0){
    $str[] = $arrayNumber[2] . ' millions';
}
$strArr = array_reverse($str);
echo join(' ', $strArr);

?>

14 millions 500 thounsands 400 hundreds