216998 has 4 divisors (see below), whose sum is σ = 325500. Its totient is φ = 108498.

The previous prime is 216991. The next prime is 217001. The reversal of 216998 is 899612.

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

It is a plaindrome in base 15.

It is a congruent number.

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

216998 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 as a sum of consecutive naturals, namely, 54248 + ... + 54251.

It is an arithmetic number, because the mean of its divisors is an integer number (81375).

2²¹⁶⁹⁹⁸ is an apocalyptic number.

216998 is a deficient number, since it is larger than the sum of its proper divisors (108502).

216998 is a wasteful number, since it uses less digits than its factorization.

216998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108501.

The product of its digits is 7776, while the sum is 35.

The square root of 216998 is about 465.8304412552. The cubic root of 216998 is about 60.0922654528.

The spelling of 216998 in words is "two hundred sixteen thousand, nine hundred ninety-eight".