218271138 has 16 divisors (see below), whose sum is σ = 438418656. Its totient is φ = 72444320.

The previous prime is 218271133. The next prime is 218271191. The reversal of 218271138 is 831172812.

It is a junction number, because it is equal to n+sod(n) for n = 218271099 and 218271108.

It is not an unprimeable number, because it can be changed into a prime (218271133) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 76668 + ... + 79463.

It is an arithmetic number, because the mean of its divisors is an integer number (27401166).

Almost surely, 2^218271138 is an apocalyptic number.

218271138 is an abundant number, since it is smaller than the sum of its proper divisors (220147518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218271138 is a wasteful number, since it uses less digits than its factorization.

218271138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156369.

The product of its digits is 5376, while the sum is 33.

The square root of 218271138 is about 14774.0020982806. The cubic root of 218271138 is about 602.0955779563.

The spelling of 218271138 in words is "two hundred eighteen million, two hundred seventy-one thousand, one hundred thirty-eight".