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We present the results of a detailed multi-wavelength study of a sample ofsixteen narrow-line Seyfert 1 (NLSy1) galaxies known in $\gamma$-rays so far.This includes a focused X-ray spectral analysis, to compare them with a moregeneral NLSy1 population, and a broadband spectral energy distribution (SED)modeling considering the leptonic radiative processes to understand theirsimilarity/dissimilarity with blazars. The X-ray spectra of $\gamma$-NLSy1galaxies exhibit similarities both with typical NLSy1 sources below $\lesssim$2keV and blazars at higher energies. We also find weak evidences of excessabsorption in the soft X-ray spectra of 3 sources and a tentative detection ofFe line in 1H~0323+342. A comparison of the broadband parameters derived fromthe SED modeling reveals the similarity of $\gamma$-NLSy1 objects with blazars,in particular more with flat spectrum radio quasars. The $\gamma$-NLS1 galaxieshost relatively low power jets with small bulk Lorentz factors with respect toblazars and this explains the paucity of such sources in the $\gamma$-raycatalogs and identification of an even fewer parent population members. Many ofthe observed features of these intriguing objects suggest they host low-massblack holes. The accretion rate in Eddington units can be considered as thedriving factor to explain the physical properties of $\gamma$-NLSy1 sources,similar to that which is known for general blazar population.

General Physical Properties of Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies