218966 has 16 divisors (see below), whose sum is σ = 369360. Its totient is φ = 96480.

The previous prime is 218963. The next prime is 218969. The reversal of 218966 is 669812.

218966 is nontrivially palindromic in base 13.

It is an interprime number because it is at equal distance from previous prime (218963) and next prime (218969).

It is a super-2 number, since 2×218966² = 95892218312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218963) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 680 + ... + 948.

It is an arithmetic number, because the mean of its divisors is an integer number (23085).

2²¹⁸⁹⁶⁶ is an apocalyptic number.

218966 is a deficient number, since it is larger than the sum of its proper divisors (150394).

218966 is a wasteful number, since it uses less digits than its factorization.

218966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319.

The product of its digits is 5184, while the sum is 32.

The square root of 218966 is about 467.9380300852. The cubic root of 218966 is about 60.2733821082.

The spelling of 218966 in words is "two hundred eighteen thousand, nine hundred sixty-six".