218323 has 4 divisors (see below), whose sum is σ = 249520. Its totient is φ = 187128.

The previous prime is 218287. The next prime is 218357. The reversal of 218323 is 323812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 218323 - 2¹³ = 210131 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218323.

It is not an unprimeable number, because it can be changed into a prime (218363) 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, 15588 + ... + 15601.

It is an arithmetic number, because the mean of its divisors is an integer number (62380).

2²¹⁸³²³ is an apocalyptic number.

218323 is a deficient number, since it is larger than the sum of its proper divisors (31197).

218323 is an equidigital number, since it uses as much as digits as its factorization.

218323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31196.

The product of its digits is 288, while the sum is 19.

The square root of 218323 is about 467.2504681646. The cubic root of 218323 is about 60.2143260865.

The spelling of 218323 in words is "two hundred eighteen thousand, three hundred twenty-three".