218838550 has 24 divisors (see below), whose sum is σ = 465188976. Its totient is φ = 75030240.

The previous prime is 218838541. The next prime is 218838551. The reversal of 218838550 is 55838812.

It is a super-2 number, since 2×218838550² = 95780621932205000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218838551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312277 + ... + 312976.

It is an arithmetic number, because the mean of its divisors is an integer number (19382874).

Almost surely, 2^218838550 is an apocalyptic number.

218838550 is an abundant number, since it is smaller than the sum of its proper divisors (246350426).

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

218838550 is a wasteful number, since it uses less digits than its factorization.

218838550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625272 (or 625267 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 218838550 is about 14793.1926912347. The cubic root of 218838550 is about 602.6168572083.

The spelling of 218838550 in words is "two hundred eighteen million, eight hundred thirty-eight thousand, five hundred fifty".