218949 has 8 divisors (see below), whose sum is σ = 297120. Its totient is φ = 143376.

The previous prime is 218947. The next prime is 218963. The reversal of 218949 is 949812.

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

It is not a de Polignac number, because 218949 - 2¹ = 218947 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218941) 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, 442 + ... + 795.

It is an arithmetic number, because the mean of its divisors is an integer number (37140).

2²¹⁸⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

218949 is a deficient number, since it is larger than the sum of its proper divisors (78171).

218949 is a wasteful number, since it uses less digits than its factorization.

218949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299.

The product of its digits is 5184, while the sum is 33.

The square root of 218949 is about 467.9198649342. The cubic root of 218949 is about 60.2718222404.

The spelling of 218949 in words is "two hundred eighteen thousand, nine hundred forty-nine".