216849 has 12 divisors (see below), whose sum is σ = 303248. Its totient is φ = 137760.

The previous prime is 216841. The next prime is 216851. The reversal of 216849 is 948612.

216849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216849 - 2³ = 216841 is a prime.

It is a Duffinian number.

Its product of digits (3456) is a multiple of the sum of its prime factors (128).

It is not an unprimeable number, because it can be changed into a prime (216841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5022 + ... + 5064.

2²¹⁶⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

216849 is a deficient number, since it is larger than the sum of its proper divisors (86399).

216849 is an equidigital number, since it uses as much as digits as its factorization.

216849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 87 counting only the distinct ones).

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

The square root of 216849 is about 465.6704843556. The cubic root of 216849 is about 60.0785083403.

The spelling of 216849 in words is "two hundred sixteen thousand, eight hundred forty-nine".