218388855 has 16 divisors (see below), whose sum is σ = 350383104. Its totient is φ = 116153760.

The previous prime is 218388809. The next prime is 218388857. The reversal of 218388855 is 558883812.

It is a happy number.

218388855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218388855 - 2⁶ = 218388791 is a prime.

It is a super-2 number, since 2×218388855² = 95387383976422050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218388857) 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, 14331 + ... + 25340.

It is an arithmetic number, because the mean of its divisors is an integer number (21898944).

Almost surely, 2^218388855 is an apocalyptic number.

218388855 is a deficient number, since it is larger than the sum of its proper divisors (131994249).

218388855 is a wasteful number, since it uses less digits than its factorization.

218388855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40046.

The product of its digits is 614400, while the sum is 48.

The square root of 218388855 is about 14777.9854851735. The cubic root of 218388855 is about 602.2037983223.

The spelling of 218388855 in words is "two hundred eighteen million, three hundred eighty-eight thousand, eight hundred fifty-five".