218877930 has 32 divisors (see below), whose sum is σ = 583675200. Its totient is φ = 58367376.

The previous prime is 218877899. The next prime is 218877947. The reversal of 218877930 is 39778812.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405060 + ... + 405599.

It is an arithmetic number, because the mean of its divisors is an integer number (18239850).

Almost surely, 2^218877930 is an apocalyptic number.

218877930 is an abundant number, since it is smaller than the sum of its proper divisors (364797270).

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

218877930 is a wasteful number, since it uses less digits than its factorization.

218877930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810675 (or 810669 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 218877930 is about 14794.5236489723. The cubic root of 218877930 is about 602.6530020108.

The spelling of 218877930 in words is "two hundred eighteen million, eight hundred seventy-seven thousand, nine hundred thirty".