218423466 has 48 divisors (see below), whose sum is σ = 497078400. Its totient is φ = 71873568.

The previous prime is 218423459. The next prime is 218423483. The reversal of 218423466 is 664324812.

It is a self number, because there is not a number n which added to its sum of digits gives 218423466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35550 + ... + 41238.

It is an arithmetic number, because the mean of its divisors is an integer number (10355800).

Almost surely, 2^218423466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218423466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248539200).

218423466 is an abundant number, since it is smaller than the sum of its proper divisors (278654934).

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

218423466 is an equidigital number, since it uses as much as digits as its factorization.

218423466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5785 (or 5773 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 218423466 is about 14779.1564711928. The cubic root of 218423466 is about 602.2356097360.

The spelling of 218423466 in words is "two hundred eighteen million, four hundred twenty-three thousand, four hundred sixty-six".