218398 has 4 divisors (see below), whose sum is σ = 327600. Its totient is φ = 109198.

The previous prime is 218389. The next prime is 218401. The reversal of 218398 is 893812.

218398 is digitally balanced in base 3, 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 is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54598 + ... + 54601.

It is an arithmetic number, because the mean of its divisors is an integer number (81900).

2²¹⁸³⁹⁸ is an apocalyptic number.

218398 is a deficient number, since it is larger than the sum of its proper divisors (109202).

218398 is a wasteful number, since it uses less digits than its factorization.

218398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109201.

The product of its digits is 3456, while the sum is 31.

The square root of 218398 is about 467.3307180146. The cubic root of 218398 is about 60.2212203936.

It can be divided in two parts, 218 and 398, that added together give a palindrome (616).

The spelling of 218398 in words is "two hundred eighteen thousand, three hundred ninety-eight".