216915 has 8 divisors (see below), whose sum is σ = 347088. Its totient is φ = 115680.

The previous prime is 216911. The next prime is 216917. The reversal of 216915 is 519612.

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

It is not a de Polignac number, because 216915 - 2² = 216911 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (216911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7216 + ... + 7245.

It is an arithmetic number, because the mean of its divisors is an integer number (43386).

2²¹⁶⁹¹⁵ is an apocalyptic number.

216915 is a deficient number, since it is larger than the sum of its proper divisors (130173).

216915 is a wasteful number, since it uses less digits than its factorization.

216915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14469.

The product of its digits is 540, while the sum is 24.

The square root of 216915 is about 465.7413445250. The cubic root of 216915 is about 60.0846028721.

The spelling of 216915 in words is "two hundred sixteen thousand, nine hundred fifteen".