218343 has 8 divisors (see below), whose sum is σ = 295408. Its totient is φ = 143424.

The previous prime is 218287. The next prime is 218357. The reversal of 218343 is 343812.

It is a happy number.

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

It is not a de Polignac number, because 218343 - 2⁶ = 218279 is a prime.

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

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218363) 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, 280 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (36926).

2²¹⁸³⁴³ is an apocalyptic number.

218343 is a deficient number, since it is larger than the sum of its proper divisors (77065).

218343 is an equidigital number, since it uses as much as digits as its factorization.

218343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073.

The product of its digits is 576, while the sum is 21.

The square root of 218343 is about 467.2718694722. The cubic root of 218343 is about 60.2161647227.

It can be divided in two parts, 218 and 343, that added together give a triangular number (561 = T₃₃).

The spelling of 218343 in words is "two hundred eighteen thousand, three hundred forty-three".