218638142 has 4 divisors (see below), whose sum is σ = 327957216. Its totient is φ = 109319070.

The previous prime is 218638141. The next prime is 218638151. The reversal of 218638142 is 241836812.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218638141) by changing a digit.

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 as a sum of consecutive naturals, namely, 54659534 + ... + 54659537.

It is an arithmetic number, because the mean of its divisors is an integer number (81989304).

Almost surely, 2^218638142 is an apocalyptic number.

218638142 is a deficient number, since it is larger than the sum of its proper divisors (109319074).

218638142 is a wasteful number, since it uses less digits than its factorization.

218638142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109319073.

The product of its digits is 18432, while the sum is 35.

The square root of 218638142 is about 14786.4174836233. The cubic root of 218638142 is about 602.4328461738.

The spelling of 218638142 in words is "two hundred eighteen million, six hundred thirty-eight thousand, one hundred forty-two".