218755138 has 8 divisors (see below), whose sum is σ = 375008832. Its totient is φ = 93752196.

The previous prime is 218755129. The next prime is 218755153. The reversal of 218755138 is 831557812.

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

It is a self number, because there is not a number n which added to its sum of digits gives 218755138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7812670 + ... + 7812697.

It is an arithmetic number, because the mean of its divisors is an integer number (46876104).

Almost surely, 2^218755138 is an apocalyptic number.

218755138 is a deficient number, since it is larger than the sum of its proper divisors (156253694).

218755138 is a wasteful number, since it uses less digits than its factorization.

218755138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15625376.

The product of its digits is 67200, while the sum is 40.

The square root of 218755138 is about 14790.3731528315. The cubic root of 218755138 is about 602.5402834587.

The spelling of 218755138 in words is "two hundred eighteen million, seven hundred fifty-five thousand, one hundred thirty-eight".