216904 has 16 divisors (see below), whose sum is σ = 428400. Its totient is φ = 102672.

The previous prime is 216901. The next prime is 216911. The reversal of 216904 is 409612.

216904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562 + ... + 865.

It is an arithmetic number, because the mean of its divisors is an integer number (26775).

2²¹⁶⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

216904 is a deficient number, since it is larger than the sum of its proper divisors (211496).

216904 is a wasteful number, since it uses less digits than its factorization.

216904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452 (or 1448 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 216904 is about 465.7295352455. The cubic root of 216904 is about 60.0835872026.

The spelling of 216904 in words is "two hundred sixteen thousand, nine hundred four".