218861238 has 32 divisors (see below), whose sum is σ = 458286336. Its totient is φ = 69547808.

The previous prime is 218861191. The next prime is 218861249. The reversal of 218861238 is 832168812.

218861238 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 = 218861196 and 218861205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41245 + ... + 46247.

It is an arithmetic number, because the mean of its divisors is an integer number (14321448).

Almost surely, 2^218861238 is an apocalyptic number.

218861238 is an abundant number, since it is smaller than the sum of its proper divisors (239425098).

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

218861238 is a wasteful number, since it uses less digits than its factorization.

218861238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5348.

The product of its digits is 36864, while the sum is 39.

The square root of 218861238 is about 14793.9595105570. The cubic root of 218861238 is about 602.6376818433.

The spelling of 218861238 in words is "two hundred eighteen million, eight hundred sixty-one thousand, two hundred thirty-eight".