216489 has 24 divisors (see below), whose sum is σ = 363072. Its totient is φ = 112320.

The previous prime is 216481. The next prime is 216493. The reversal of 216489 is 984612.

It is not a de Polignac number, because 216489 - 2³ = 216481 is a prime.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (216481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3519 + ... + 3579.

It is an arithmetic number, because the mean of its divisors is an integer number (15128).

2²¹⁶⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

216489 is a deficient number, since it is larger than the sum of its proper divisors (146583).

216489 is a wasteful number, since it uses less digits than its factorization.

216489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 84 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 216489 is about 465.2837843725. The cubic root of 216489 is about 60.0452436527.

The spelling of 216489 in words is "two hundred sixteen thousand, four hundred eighty-nine".