218471814 has 48 divisors (see below), whose sum is σ = 522961920. Its totient is φ = 65360880.

The previous prime is 218471801. The next prime is 218471831. The reversal of 218471814 is 418174812.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8659 + ... + 22625.

It is an arithmetic number, because the mean of its divisors is an integer number (10895040).

Almost surely, 2^218471814 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218471814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261480960).

218471814 is an abundant number, since it is smaller than the sum of its proper divisors (304490106).

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

218471814 is a wasteful number, since it uses less digits than its factorization.

218471814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14065 (or 14062 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 218471814 is about 14780.7920626738. The cubic root of 218471814 is about 602.2800413772.

The spelling of 218471814 in words is "two hundred eighteen million, four hundred seventy-one thousand, eight hundred fourteen".