  In this paper we consider monic polynomials such that their coefficients
coincide with their zeros. These polynomials were first introduced by S. Ulam.
We combine methods of algebraic geometry and dynamical systems to prove several
results. We obtain estimates on the number of Ulam polynomials of degree $N$.
We provide additional methods to obtain algebraic identities satisfied by the
zeros of Ulam polynomials, beyond the straightforward comparison of their zeros
and coefficients. To address the question about existence of orthogonal Ulam
polynomial sequences, we show that the only Ulam polynomial eigenfunctions of
hypergeometric type differential operators are the trivial Ulam polynomials
$\{x^N\}_{N=0}^\infty$. We propose a family of solvable $N$-body problems such
that their stable equilibria are the zeros of certain Ulam polynomials.
