218416138 has 4 divisors (see below), whose sum is σ = 327624210. Its totient is φ = 109208068.

The previous prime is 218416129. The next prime is 218416147. The reversal of 218416138 is 831614812.

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

It is an interprime number because it is at equal distance from previous prime (218416129) and next prime (218416147).

It can be written as a sum of positive squares in only one way, i.e., 205549569 + 12866569 = 14337^2 + 3587^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54604033 + ... + 54604036.

Almost surely, 2^218416138 is an apocalyptic number.

218416138 is a deficient number, since it is larger than the sum of its proper divisors (109208072).

218416138 is a wasteful number, since it uses less digits than its factorization.

218416138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109208071.

The product of its digits is 9216, while the sum is 34.

The square root of 218416138 is about 14778.9085523932. The cubic root of 218416138 is about 602.2288747578.

The spelling of 218416138 in words is "two hundred eighteen million, four hundred sixteen thousand, one hundred thirty-eight".