218998 has 8 divisors (see below), whose sum is σ = 353808. Its totient is φ = 101064.

The previous prime is 218993. The next prime is 219001. The reversal of 218998 is 899812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218993) 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, 4186 + ... + 4237.

It is an arithmetic number, because the mean of its divisors is an integer number (44226).

2²¹⁸⁹⁹⁸ is an apocalyptic number.

218998 is a deficient number, since it is larger than the sum of its proper divisors (134810).

218998 is a wasteful number, since it uses less digits than its factorization.

218998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8438.

The product of its digits is 10368, while the sum is 37.

The square root of 218998 is about 467.9722213978. The cubic root of 218998 is about 60.2763181108.

The spelling of 218998 in words is "two hundred eighteen thousand, nine hundred ninety-eight".