function updateNumbers() {
global $wpdb;
$querystr = "SELECT $wpdb->posts.* FROM $wpdb->

posts WHERE $wpdb->posts.post_status = 'publish' AND $wpdb->

posts.post_type = 'post' ";
$pageposts = $wpdb->get_results($querystr, OBJECT);
$counts = 0 ;
if ($pageposts):
foreach ($pageposts as $post):
setup_postdata($post);
$counts++;
add_post_meta($post->ID, 'incr_number', $counts, true);
update_post_meta($post->ID, 'incr_number', $counts);
endforeach;
endif;
}
add_action ( 'publish_post', 'updateNumbers' );
add_action ( 'deleted_post', 'updateNumbers' );
add_action ( 'edit_post', 'updateNumbers' );

<?php echo get_post_meta($post->ID,'incr_number',true); ?>