Wordpress: Recommended File & Folder Permissions
Root directory 0755
wp-admin 0755
wp-content 0755
wp-includes 0755
.htaccess 0640
readme.html 0400
wp-config.php 0644
wp-admin/index.php 0644
wp-admin/.htaccess 0640
Via: http://orangecopper.com/blog/recommended-file-and-folder-permissions-for-your-wordpress-blog-installation