218560940 has 36 divisors (see below), whose sum is σ = 497007504. Its totient is φ = 80698176.

The previous prime is 218560931. The next prime is 218560963. The reversal of 218560940 is 49065812.

It is a self number, because there is not a number n which added to its sum of digits gives 218560940.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28952 + ... + 35711.

It is an arithmetic number, because the mean of its divisors is an integer number (13805764).

Almost surely, 2^218560940 is an apocalyptic number.

218560940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218560940 is an abundant number, since it is smaller than the sum of its proper divisors (278446564).

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

218560940 is a wasteful number, since it uses less digits than its factorization.

218560940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64698 (or 64683 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 218560940 is about 14783.8066816365. The cubic root of 218560940 is about 602.3619306793.

The spelling of 218560940 in words is "two hundred eighteen million, five hundred sixty thousand, nine hundred forty".