218353938 has 48 divisors (see below), whose sum is σ = 487290720. Its totient is φ = 65180280.

The previous prime is 218353931. The next prime is 218353943. The reversal of 218353938 is 839353812.

It is a self number, because there is not a number n which added to its sum of digits gives 218353938.

It is not an unprimeable number, because it can be changed into a prime (218353931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3258981 + ... + 3259047.

It is an arithmetic number, because the mean of its divisors is an integer number (10151890).

Almost surely, 2^218353938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218353938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243645360).

218353938 is an abundant number, since it is smaller than the sum of its proper divisors (268936782).

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

218353938 is an frugal number, since it uses more digits than its factorization.

218353938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 83 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 218353938 is about 14776.8040522976. The cubic root of 218353938 is about 602.1717022541.

The spelling of 218353938 in words is "two hundred eighteen million, three hundred fifty-three thousand, nine hundred thirty-eight".