  Self-consistent calculations within the relativistic mean field theory (RMFT)
were performed for 150 spherical even-even nuclei. The macroscopic part of the
binding energy was evaluated by subtracting the Strutinsky shell corrections
from the RMFT energy. The parameters of a liquid-drop (LD), like mass formula
which approximates the RMFT results, were determined. The mass and isospin
dependence of the RMFT mean-square radii constant for the neutron, proton,
charge and total density distributions were estimated. The RMFT liquid-drop
parameters and the radii constants are compared with similar results obtained
with the Hartree-Fock-Bogoliubov calculations with the Gogny force (HFB+Gogny)
and phenomenological models.
