218532538 has 16 divisors (see below), whose sum is σ = 374817024. Its totient is φ = 93609360.

The previous prime is 218532527. The next prime is 218532541. The reversal of 218532538 is 835235812.

218532538 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 218532497 and 218532506.

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 7 ways as a sum of consecutive naturals, for example, 51103 + ... + 55213.

It is an arithmetic number, because the mean of its divisors is an integer number (23426064).

Almost surely, 2^218532538 is an apocalyptic number.

218532538 is a deficient number, since it is larger than the sum of its proper divisors (156284486).

218532538 is a wasteful number, since it uses less digits than its factorization.

218532538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7917.

The product of its digits is 57600, while the sum is 37.

The square root of 218532538 is about 14782.8460723908. The cubic root of 218532538 is about 602.3358372327.

The spelling of 218532538 in words is "two hundred eighteen million, five hundred thirty-two thousand, five hundred thirty-eight".