218578242 has 16 divisors (see below), whose sum is σ = 460164960. Its totient is φ = 69024672.

The previous prime is 218578237. The next prime is 218578267. The reversal of 218578242 is 242875812.

It is a self number, because there is not a number n which added to its sum of digits gives 218578242.

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, 958563 + ... + 958790.

It is an arithmetic number, because the mean of its divisors is an integer number (28760310).

Almost surely, 2^218578242 is an apocalyptic number.

218578242 is an abundant number, since it is smaller than the sum of its proper divisors (241586718).

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

218578242 is a wasteful number, since it uses less digits than its factorization.

218578242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917377.

The product of its digits is 71680, while the sum is 39.

The square root of 218578242 is about 14784.3918373398. The cubic root of 218578242 is about 602.3778252412.

The spelling of 218578242 in words is "two hundred eighteen million, five hundred seventy-eight thousand, two hundred forty-two".