216466 has 4 divisors (see below), whose sum is σ = 324702. Its totient is φ = 108232.

The previous prime is 216451. The next prime is 216481. The reversal of 216466 is 664612.

It is a happy number.

216466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (216451) and next prime (216481).

It can be written as a sum of positive squares in only one way, i.e., 164025 + 52441 = 405^2 + 229^2 .

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 216466.

It is an unprimeable number.

216466 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54115 + ... + 54118.

2²¹⁶⁴⁶⁶ is an apocalyptic number.

216466 is a deficient number, since it is larger than the sum of its proper divisors (108236).

216466 is a wasteful number, since it uses less digits than its factorization.

216466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108235.

The product of its digits is 1728, while the sum is 25.

The square root of 216466 is about 465.2590676172. The cubic root of 216466 is about 60.0431171559.

The spelling of 216466 in words is "two hundred sixteen thousand, four hundred sixty-six".