218411138 has 32 divisors (see below), whose sum is σ = 379634688. Its totient is φ = 93139200.

The previous prime is 218411131. The next prime is 218411143. The reversal of 218411138 is 831114812.

It is a self number, because there is not a number n which added to its sum of digits gives 218411138.

It is not an unprimeable number, because it can be changed into a prime (218411131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147743 + ... + 149213.

It is an arithmetic number, because the mean of its divisors is an integer number (11863584).

Almost surely, 2^218411138 is an apocalyptic number.

218411138 is a deficient number, since it is larger than the sum of its proper divisors (161223550).

218411138 is a wasteful number, since it uses less digits than its factorization.

218411138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898.

The product of its digits is 1536, while the sum is 29.

The square root of 218411138 is about 14778.7393914366. The cubic root of 218411138 is about 602.2242792986.

The spelling of 218411138 in words is "two hundred eighteen million, four hundred eleven thousand, one hundred thirty-eight".