h = sage.misc.html.HTMLFragmentFactory()

a = h('<b>x</b>')

a = h(2/3)

def scinot(x,ndp):
    string="%."+str(ndp)+"e"
    base, expo = (string % x).split('e')
    return '{0}&#215;10<sup>{1}</sup>'.format(base,int(expo))

html(scinot(332413.4959494995, 3))