218474984 has 64 divisors (see below), whose sum is σ = 511203840. Its totient is φ = 85224960.

The previous prime is 218474983. The next prime is 218474989. The reversal of 218474984 is 489474812.

It is not an unprimeable number, because it can be changed into a prime (218474983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51089 + ... + 55199.

It is an arithmetic number, because the mean of its divisors is an integer number (7987560).

Almost surely, 2^218474984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218474984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255601920).

218474984 is an abundant number, since it is smaller than the sum of its proper divisors (292728856).

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

218474984 is a wasteful number, since it uses less digits than its factorization.

218474984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4210 (or 4206 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The square root of 218474984 is about 14780.8992960510. The cubic root of 218474984 is about 602.2829543670.

The spelling of 218474984 in words is "two hundred eighteen million, four hundred seventy-four thousand, nine hundred eighty-four".