  In this paper, we investigate properties of harmonic entire mappings.
Firstly, we give the characterizations of the order and the type for a harmonic
entire mapping $f=h+\overline{g}$, respectively, and also consider the
relationship between the order and the type of $f$, $h$, and $g$. Secondly, we
investigate the harmonic mappings $f=h+\overline{g}$ such that
$f^{(n_p)}=h^{(n_p)}+\overline{g^{(n_p)}}$ are univalent in the unit disk,
where $\{n_p\}_{p=1}^{\infty}$ be a strictly increasing sequence of nonnegative
integers. In terms of the sequence $\{n_p\}_{p=1}^{\infty}$, we derive several
necessary conditions for these mappings to be entire and also establish an
upper bound for the order of these mappings.
