218987418 has 16 divisors (see below), whose sum is σ = 471665376. Its totient is φ = 67380720.

The previous prime is 218987413. The next prime is 218987443. The reversal of 218987418 is 814789812.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218987413) 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, 1403688 + ... + 1403843.

It is an arithmetic number, because the mean of its divisors is an integer number (29479086).

Almost surely, 2^218987418 is an apocalyptic number.

218987418 is an abundant number, since it is smaller than the sum of its proper divisors (252677958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218987418 is a wasteful number, since it uses less digits than its factorization.

218987418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807549.

The product of its digits is 258048, while the sum is 48.

The square root of 218987418 is about 14798.2234744580. The cubic root of 218987418 is about 602.7534724310.

The spelling of 218987418 in words is "two hundred eighteen million, nine hundred eighty-seven thousand, four hundred eighteen".