216994 has 4 divisors (see below), whose sum is σ = 325494. Its totient is φ = 108496.

The previous prime is 216991. The next prime is 217001. The reversal of 216994 is 499612.

It is a happy number.

216994 is digitally balanced in base 3, 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 can be written as a sum of positive squares in only one way, i.e., 119025 + 97969 = 345^2 + 313^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (216991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54247 + ... + 54250.

2²¹⁶⁹⁹⁴ is an apocalyptic number.

216994 is a deficient number, since it is larger than the sum of its proper divisors (108500).

216994 is a wasteful number, since it uses less digits than its factorization.

216994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108499.

The product of its digits is 3888, while the sum is 31.

The square root of 216994 is about 465.8261478277. The cubic root of 216994 is about 60.0918962166.

The spelling of 216994 in words is "two hundred sixteen thousand, nine hundred ninety-four".