218990 has 16 divisors (see below), whose sum is σ = 401760. Its totient is φ = 85920.

The previous prime is 218989. The next prime is 218993. The reversal of 218990 is 99812.

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 7 ways as a sum of consecutive naturals, for example, 431 + ... + 789.

It is an arithmetic number, because the mean of its divisors is an integer number (25110).

2²¹⁸⁹⁹⁰ is an apocalyptic number.

218990 is a deficient number, since it is larger than the sum of its proper divisors (182770).

218990 is a wasteful number, since it uses less digits than its factorization.

218990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 218990 is about 467.9636738039. The cubic root of 218990 is about 60.2755841370.

The spelling of 218990 in words is "two hundred eighteen thousand, nine hundred ninety".