218916855 has 24 divisors (see below), whose sum is σ = 379916160. Its totient is φ = 116614080.

The previous prime is 218916847. The next prime is 218916857. The reversal of 218916855 is 558619812.

It is a happy number.

It is not a de Polignac number, because 218916855 - 2³ = 218916847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 218916855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218916857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42141 + ... + 47049.

It is an arithmetic number, because the mean of its divisors is an integer number (15829840).

Almost surely, 2^218916855 is an apocalyptic number.

218916855 is a deficient number, since it is larger than the sum of its proper divisors (160999305).

218916855 is a wasteful number, since it uses less digits than its factorization.

218916855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5911 (or 5908 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 218916855 is about 14795.8391110474. The cubic root of 218916855 is about 602.6887249328.

It can be divided in two parts, 2189 and 16855, that added together give a square (19044 = 138²).

The spelling of 218916855 in words is "two hundred eighteen million, nine hundred sixteen thousand, eight hundred fifty-five".