218129232 has 20 divisors (see below), whose sum is σ = 563500640. Its totient is φ = 72709728.

The previous prime is 218129207. The next prime is 218129243. The reversal of 218129232 is 232921812.

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

It is a self number, because there is not a number n which added to its sum of digits gives 218129232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2272132 + ... + 2272227.

It is an arithmetic number, because the mean of its divisors is an integer number (28175032).

Almost surely, 2^218129232 is an apocalyptic number.

It is an amenable number.

218129232 is an abundant number, since it is smaller than the sum of its proper divisors (345371408).

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

218129232 is a wasteful number, since it uses less digits than its factorization.

218129232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4544370 (or 4544364 counting only the distinct ones).

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

The square root of 218129232 is about 14769.1987595807. The cubic root of 218129232 is about 601.9650682630.

It can be divided in two parts, 2181 and 29232, that added together give a palindrome (31413).

The spelling of 218129232 in words is "two hundred eighteen million, one hundred twenty-nine thousand, two hundred thirty-two".