218973 has 8 divisors (see below), whose sum is σ = 298368. Its totient is φ = 142784.

The previous prime is 218971. The next prime is 218987. The reversal of 218973 is 379812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 218973 - 2¹ = 218971 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 218973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636 + ... + 917.

It is an arithmetic number, because the mean of its divisors is an integer number (37296).

2²¹⁸⁹⁷³ is an apocalyptic number.

It is an amenable number.

218973 is a deficient number, since it is larger than the sum of its proper divisors (79395).

218973 is a wasteful number, since it uses less digits than its factorization.

218973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603.

The product of its digits is 3024, while the sum is 30.

The square root of 218973 is about 467.9455096483. The cubic root of 218973 is about 60.2740243832.

The spelling of 218973 in words is "two hundred eighteen thousand, nine hundred seventy-three".