218480388 has 24 divisors (see below), whose sum is σ = 582614592. Its totient is φ = 62422944.

The previous prime is 218480371. The next prime is 218480399. The reversal of 218480388 is 883084812.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1300395 + ... + 1300562.

It is an arithmetic number, because the mean of its divisors is an integer number (24275608).

Almost surely, 2^218480388 is an apocalyptic number.

218480388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

218480388 is an abundant number, since it is smaller than the sum of its proper divisors (364134204).

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

218480388 is a wasteful number, since it uses less digits than its factorization.

218480388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600971 (or 2600969 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The square root of 218480388 is about 14781.0820984121. The cubic root of 218480388 is about 602.2879201686.

The spelling of 218480388 in words is "two hundred eighteen million, four hundred eighty thousand, three hundred eighty-eight".