216884979 has 16 divisors (see below), whose sum is σ = 321667200. Its totient is φ = 144429768.

The previous prime is 216884947. The next prime is 216884999. The reversal of 216884979 is 979488612.

It is not a de Polignac number, because 216884979 - 2⁵ = 216884947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216884909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23572 + ... + 31454.

It is an arithmetic number, because the mean of its divisors is an integer number (20104200).

Almost surely, 2^216884979 is an apocalyptic number.

216884979 is a deficient number, since it is larger than the sum of its proper divisors (104782221).

216884979 is a wasteful number, since it uses less digits than its factorization.

216884979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8911 (or 8905 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 216884979 is about 14727.0152780528. The cubic root of 216884979 is about 600.8183084448.

The spelling of 216884979 in words is "two hundred sixteen million, eight hundred eighty-four thousand, nine hundred seventy-nine".