218308452 has 12 divisors (see below), whose sum is σ = 509386416. Its totient is φ = 72769480.

The previous prime is 218308451. The next prime is 218308459. The reversal of 218308452 is 254803812.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (218308451) 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 3 ways as a sum of consecutive naturals, for example, 9096174 + ... + 9096197.

It is an arithmetic number, because the mean of its divisors is an integer number (42448868).

Almost surely, 2^218308452 is an apocalyptic number.

It is an amenable number.

218308452 is an abundant number, since it is smaller than the sum of its proper divisors (291077964).

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

218308452 is a wasteful number, since it uses less digits than its factorization.

218308452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18192378 (or 18192376 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 218308452 is about 14775.2648707223. The cubic root of 218308452 is about 602.1298859192.

Adding to 218308452 its product of nonzero digits (15360), we get a palindrome (218323812).

The spelling of 218308452 in words is "two hundred eighteen million, three hundred eight thousand, four hundred fifty-two".