216345 has 8 divisors (see below), whose sum is σ = 346176. Its totient is φ = 115376.

The previous prime is 216329. The next prime is 216347. The reversal of 216345 is 543612.

It is a happy number.

216345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216345 - 2⁴ = 216329 is a prime.

It is an alternating number because its digits alternate between even and odd.

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 in 7 ways as a sum of consecutive naturals, for example, 7197 + ... + 7226.

It is an arithmetic number, because the mean of its divisors is an integer number (43272).

2²¹⁶³⁴⁵ is an apocalyptic number.

It is an amenable number.

216345 is a deficient number, since it is larger than the sum of its proper divisors (129831).

216345 is a wasteful number, since it uses less digits than its factorization.

216345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14431.

The product of its digits is 720, while the sum is 21.

The square root of 216345 is about 465.1290143605. The cubic root of 216345 is about 60.0319274521.

Adding to 216345 its reverse (543612), we get a palindrome (759957).

It can be divided in two parts, 216 and 345, that added together give a triangular number (561 = T₃₃).

The spelling of 216345 in words is "two hundred sixteen thousand, three hundred forty-five".