216684942 has 16 divisors (see below), whose sum is σ = 434207952. Its totient is φ = 72088640.

The previous prime is 216684929. The next prime is 216684961. The reversal of 216684942 is 249486612.

It is a junction number, because it is equal to n+sod(n) for n = 216684894 and 216684903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31533 + ... + 37784.

It is an arithmetic number, because the mean of its divisors is an integer number (27137997).

Almost surely, 2^216684942 is an apocalyptic number.

216684942 is an abundant number, since it is smaller than the sum of its proper divisors (217523010).

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

216684942 is a wasteful number, since it uses less digits than its factorization.

216684942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69843.

The product of its digits is 165888, while the sum is 42.

The square root of 216684942 is about 14720.2222129967. Note that the first 4 decimals coincide. The cubic root of 216684942 is about 600.6335363729.

The spelling of 216684942 in words is "two hundred sixteen million, six hundred eighty-four thousand, nine hundred forty-two".