216344 has 8 divisors (see below), whose sum is σ = 405660. Its totient is φ = 108168.

The previous prime is 216329. The next prime is 216347. The reversal of 216344 is 443612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁷ + 1 + 3⁹ + 6² + 4² + 4⁸ .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216344.

It is not an unprimeable number, because it can be changed into a prime (216347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13514 + ... + 13529.

2²¹⁶³⁴⁴ is an apocalyptic number.

It is an amenable number.

216344 is a deficient number, since it is larger than the sum of its proper divisors (189316).

216344 is a wasteful number, since it uses less digits than its factorization.

216344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27049 (or 27045 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 216344 is about 465.1279393887. The cubic root of 216344 is about 60.0318349578.

Adding to 216344 its reverse (443612), we get a palindrome (659956).

The spelling of 216344 in words is "two hundred sixteen thousand, three hundred forty-four".