218855240 has 32 divisors (see below), whose sum is σ = 494614080. Its totient is φ = 87152832.

The previous prime is 218855237. The next prime is 218855267. The reversal of 218855240 is 42558812.

It is a happy number.

218855240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 218855240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2972 + ... + 21131.

It is an arithmetic number, because the mean of its divisors is an integer number (15456690).

Almost surely, 2^218855240 is an apocalyptic number.

218855240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218855240 is an abundant number, since it is smaller than the sum of its proper divisors (275758840).

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

218855240 is a wasteful number, since it uses less digits than its factorization.

218855240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24341 (or 24337 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 218855240 is about 14793.7567912954. The cubic root of 218855240 is about 602.6321765989.

The spelling of 218855240 in words is "two hundred eighteen million, eight hundred fifty-five thousand, two hundred forty".