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We present a study on the radial profiles of D4000,luminosity-weightedstellar ages $\tau_L$,and luminosity-weighted stellar metallicities $[Z/H]_L$of 3654 nearby galaxies($0.01<z<0.15$)using the IFU spectroscopic data from theMaNGA survey available in the SDSS DR15,in an effort to explore the connectionbetween median stellar population radialgradients($\nabla$D4000,$\nabla\tau_L,\nabla[Z/H]_L$)out to~$1.5R_e$ andvarious galaxy properties,including stellar mass($M_\star$),specific starformation rate(sSFR),morphologies,and local environment. We find that $M_\star$is the single most predictive physical property for$\nabla$D4000and$\nabla[Z/H]_L$. The most predictive properties for $\nabla\tau_L$ aresSFR,and to a lesser degree,$M_\star$. The environmental parameters,includinglocal galaxy overdensities and central-satellite division,have virtually nocorrelation with stellar population radial profiles for the whole sample,butthe $\nabla$D4000 of star-forming satellite galaxies with$M_\star\lesssim10^{10}M_\odot$exhibit a significant positive correlation with galaxyoverdensities. Galaxies with lower sSFR have on average steeper negativestellar population gradients,and this sSFR dependence is stronger for moremassive star-forming galaxies. The negative correlation between the medianstellar population gradients and$M_\star$ are best described largely assegmented relationships, whereby median gradients of galaxies with$\logM_\star\lesssim 10$(with the exact value depending on sSFR)have much weakermass dependence than galaxies with higher$M_\star$. While the dependence of theradial gradients of ages and metallicities on T-Types and central stellar masssurface densities are generally not significant,galaxies with later T-Types orlower central mass densities tend to have significantly lowerD4000,younger$\tau_L$ and lower$[Z/H]_L$ across the radial ranges probed inthis study.

The Most Predictive Physical Properties for the Stellar Population Radial Profiles of Nearby Galaxies