216418 has 8 divisors (see below), whose sum is σ = 326700. Its totient is φ = 107520.

The previous prime is 216401. The next prime is 216421. The reversal of 216418 is 814612.

216418 is nontrivially palindromic in base 13.

216418 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 208849 + 7569 = 457^2 + 87^2 .

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

It is an unprimeable number.

216418 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 in 3 ways as a sum of consecutive naturals, for example, 258 + ... + 706.

2²¹⁶⁴¹⁸ is an apocalyptic number.

216418 is a deficient number, since it is larger than the sum of its proper divisors (110282).

216418 is a wasteful number, since it uses less digits than its factorization.

216418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692.

The product of its digits is 384, while the sum is 22.

The square root of 216418 is about 465.2074805933. The cubic root of 216418 is about 60.0386787642.

The spelling of 216418 in words is "two hundred sixteen thousand, four hundred eighteen".