218638106 has 8 divisors (see below), whose sum is σ = 336820980. Its totient is φ = 106364448.

The previous prime is 218638099. The next prime is 218638127. The reversal of 218638106 is 601836812.

It can be written as a sum of positive squares in 2 ways, for example, as 215062225 + 3575881 = 14665^2 + 1891^2 .

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

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, 1477211 + ... + 1477358.

Almost surely, 2^218638106 is an apocalyptic number.

218638106 is a deficient number, since it is larger than the sum of its proper divisors (118182874).

218638106 is a wasteful number, since it uses less digits than its factorization.

218638106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954608.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 218638106 is about 14786.4162662898. The cubic root of 218638106 is about 602.4328131091.

The spelling of 218638106 in words is "two hundred eighteen million, six hundred thirty-eight thousand, one hundred six".