218481390 has 24 divisors (see below), whose sum is σ = 568051848. Its totient is φ = 58261680.

The previous prime is 218481353. The next prime is 218481391. The reversal of 218481390 is 93184812.

218481390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218481391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1213696 + ... + 1213875.

It is an arithmetic number, because the mean of its divisors is an integer number (23668827).

Almost surely, 2^218481390 is an apocalyptic number.

218481390 is an abundant number, since it is smaller than the sum of its proper divisors (349570458).

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

218481390 is a wasteful number, since it uses less digits than its factorization.

218481390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427584 (or 2427581 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 218481390 is about 14781.1159930501. The cubic root of 218481390 is about 602.2888409096.

The spelling of 218481390 in words is "two hundred eighteen million, four hundred eighty-one thousand, three hundred ninety".