Get ID Custom post WP

Hi. I need to output the code depending on the id of the post. The fact is that a custom post type “reviews” was created and I need to output the code depending on what ID the custom post has. Code like this, doesn’t work

    if (get_post_type($post_id) === 'reviews' && get_post_type(3700)) {
    	...
    } 

I need this to work outside of the loop WP