218389900 has 18 divisors (see below), whose sum is σ = 473906300. Its totient is φ = 87355920.

The previous prime is 218389883. The next prime is 218389909. The reversal of 218389900 is 9983812.

It is not an unprimeable number, because it can be changed into a prime (218389909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1091850 + ... + 1092049.

Almost surely, 2^218389900 is an apocalyptic number.

218389900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218389900 is an abundant number, since it is smaller than the sum of its proper divisors (255516400).

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

218389900 is a wasteful number, since it uses less digits than its factorization.

218389900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183913 (or 2183906 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 218389900 is about 14778.0208417772. The cubic root of 218389900 is about 602.2047588444.

The spelling of 218389900 in words is "two hundred eighteen million, three hundred eighty-nine thousand, nine hundred".