218338 has 4 divisors (see below), whose sum is σ = 327510. Its totient is φ = 109168.

The previous prime is 218287. The next prime is 218357. The reversal of 218338 is 833812.

218338 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 214369 + 3969 = 463^2 + 63^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54583 + ... + 54586.

2²¹⁸³³⁸ is an apocalyptic number.

218338 is a deficient number, since it is larger than the sum of its proper divisors (109172).

218338 is a wasteful number, since it uses less digits than its factorization.

218338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109171.

The product of its digits is 1152, while the sum is 25.

The square root of 218338 is about 467.2665192371. The cubic root of 218338 is about 60.2157050742.

The spelling of 218338 in words is "two hundred eighteen thousand, three hundred thirty-eight".