218284972 has 12 divisors (see below), whose sum is σ = 395171280. Its totient is φ = 105378896.

The previous prime is 218284961. The next prime is 218284987. The reversal of 218284972 is 279482812.

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, 940768 + ... + 940999.

It is an arithmetic number, because the mean of its divisors is an integer number (32930940).

Almost surely, 2^218284972 is an apocalyptic number.

It is an amenable number.

218284972 is a deficient number, since it is larger than the sum of its proper divisors (176886308).

218284972 is a wasteful number, since it uses less digits than its factorization.

218284972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881800 (or 1881798 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 218284972 is about 14774.4702781521. The cubic root of 218284972 is about 602.1082979374.

The spelling of 218284972 in words is "two hundred eighteen million, two hundred eighty-four thousand, nine hundred seventy-two".