I belive that there is not a direct command in MathCad that provide directly the conversion to Degree, Min & Sec. However, this can be obtain as follow:
Deg(X)=trunc(X)
Min(X)=trunc(60(X-Deg(X))
Sec(X)=trunc(3600.(X-Deg(X))-60.(Min(X))
ex.
X=5.23 Deg(X)=5 Min(X)=13 Sec(X)=48
Notice that MathCad recognise the unit "deg" and "rad" (See the HELP index in your program). In the simplified sample above the input value X is in degree.