218420984 has 16 divisors (see below), whose sum is σ = 413595720. Its totient is φ = 108128800.

The previous prime is 218420971. The next prime is 218421001. The reversal of 218420984 is 489024812.

218420984 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134354 + ... + 135969.

Almost surely, 2^218420984 is an apocalyptic number.

It is an amenable number.

218420984 is a deficient number, since it is larger than the sum of its proper divisors (195174736).

218420984 is a wasteful number, since it uses less digits than its factorization.

218420984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270430 (or 270426 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 218420984 is about 14779.0725013446. The cubic root of 218420984 is about 602.2333286099.

The spelling of 218420984 in words is "two hundred eighteen million, four hundred twenty thousand, nine hundred eighty-four".