216449 has 4 divisors (see below), whose sum is σ = 217536. Its totient is φ = 215364.

The previous prime is 216431. The next prime is 216451. The reversal of 216449 is 944612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 216449 - 2¹² = 212353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216149) 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, 149 + ... + 674.

It is an arithmetic number, because the mean of its divisors is an integer number (54384).

2²¹⁶⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

216449 is a deficient number, since it is larger than the sum of its proper divisors (1087).

216449 is an equidigital number, since it uses as much as digits as its factorization.

216449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086.

The product of its digits is 1728, while the sum is 26.

The square root of 216449 is about 465.2407978671. The cubic root of 216449 is about 60.0415453006.

The spelling of 216449 in words is "two hundred sixteen thousand, four hundred forty-nine".