// will display "config"
$frontName = (string)Mage::getConfig()->getNode('frontend/routers/whatever/args/frontName');

The code will return “config”, if you add the following XML to your modules config.xml:

<frontend>
        <routers>
            <whatever>
                <use>standard</use>
                <args>
                    <module>Company_Module</module>
                    <frontName>config</frontName>
                </args>
            </whatever>
        </routers>
</frontend>