Here are the recommended file permissions that you can set for your WordPress site: 

    Root directory (usually public_html): 755
    wp-admin: 755
    wp-includes: 755
    wp-content: 755
    wp-content/themes: 755
    wp-content/plugins: 755
    wp-content/uploads: 755
    .htaccess: 644
    index.php: 644
    wp-config.php: 640