216394 has 8 divisors (see below), whose sum is σ = 326628. Its totient is φ = 107520.

The previous prime is 216379. The next prime is 216397. The reversal of 216394 is 493612.

216394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

216394 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 2 ways, for example, as 216225 + 169 = 465^2 + 13^2 .

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

It is not an unprimeable number, because it can be changed into a prime (216397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304 + ... + 724.

2²¹⁶³⁹⁴ is an apocalyptic number.

216394 is a deficient number, since it is larger than the sum of its proper divisors (110234).

216394 is a wasteful number, since it uses less digits than its factorization.

216394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680.

The product of its digits is 1296, while the sum is 25.

The square root of 216394 is about 465.1816849361. The cubic root of 216394 is about 60.0364593223.

The spelling of 216394 in words is "two hundred sixteen thousand, three hundred ninety-four".