Spelling out numbers

by Earleen
(Canada)

In my novel, I have written a prologue where a number of separate scenes involving different characters are being played out with the same radio program playing in the background. The places where the background broadcast bleeds into the ongoing scene, the section is in a smaller font, indented on both sides, to separate it from the "actual" scene.

The radio host says things like:
In 1844, bla bla bla
or
the moving sentiment found in Sonnet 14 bla bla bla

The radio host is speaking live, but it is a radio broadcast. Should the date "1844" and the "14" of Sonnet 14 and similar "numbers" be be spelled out, like you would do with dialogue?