218912232 has 160 divisors (see below), whose sum is σ = 695736000. Its totient is φ = 56221440.

The previous prime is 218912231. The next prime is 218912257. The reversal of 218912232 is 232219812.

It is a self number, because there is not a number n which added to its sum of digits gives 218912232.

It is not an unprimeable number, because it can be changed into a prime (218912231) 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 39 ways as a sum of consecutive naturals, for example, 2459644 + ... + 2459732.

It is an arithmetic number, because the mean of its divisors is an integer number (4348350).

Almost surely, 2^218912232 is an apocalyptic number.

218912232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218912232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347868000).

218912232 is an abundant number, since it is smaller than the sum of its proper divisors (476823768).

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

218912232 is an equidigital number, since it uses as much as digits as its factorization.

218912232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 112 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 218912232 is about 14795.6828838685. The cubic root of 218912232 is about 602.6844824551.

The spelling of 218912232 in words is "two hundred eighteen million, nine hundred twelve thousand, two hundred thirty-two".