218313138 has 8 divisors (see below), whose sum is σ = 436626288. Its totient is φ = 72771044.

The previous prime is 218313119. The next prime is 218313181. The reversal of 218313138 is 831313812.

218313138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

218313138 is an admirable number.

It is a Curzon 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, 18192756 + ... + 18192767.

It is an arithmetic number, because the mean of its divisors is an integer number (54578286).

Almost surely, 2^218313138 is an apocalyptic number.

218313138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

218313138 is a wasteful number, since it uses less digits than its factorization.

218313138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36385528.

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

The square root of 218313138 is about 14775.4234457088. The cubic root of 218313138 is about 602.1341941360.

The spelling of 218313138 in words is "two hundred eighteen million, three hundred thirteen thousand, one hundred thirty-eight".