Enables deoxyribonucleoside 5'-monophosphate N-glycosidase activity and protein homodimerization activity. Involved in allantoin metabolic process; dGMP catabolic process; and positive regulation of cell growth. Located in nucleus. Orthologous to human DNPH1 (2'-deoxynucleoside 5'-phosphate N-hydrolase 1). [provided by Alliance of Genome Resources, Apr 2022]