216924 has 12 divisors (see below), whose sum is σ = 506184. Its totient is φ = 72304.

The previous prime is 216919. The next prime is 216947. The reversal of 216924 is 429612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 216894 and 216903.

It is a congruent number.

It is an unprimeable number.

216924 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 9027 + ... + 9050.

It is an arithmetic number, because the mean of its divisors is an integer number (42182).

2²¹⁶⁹²⁴ is an apocalyptic number.

It is an amenable number.

216924 is an abundant number, since it is smaller than the sum of its proper divisors (289260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216924 is a wasteful number, since it uses less digits than its factorization.

216924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18084 (or 18082 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 216924 is about 465.7510064401. The cubic root of 216924 is about 60.0854338488.

It can be divided in two parts, 21692 and 4, that multiplied together give a palindrome (86768).

The spelling of 216924 in words is "two hundred sixteen thousand, nine hundred twenty-four".