216984959 has 8 divisors (see below), whose sum is σ = 229190640. Its totient is φ = 204857856.

The previous prime is 216984919. The next prime is 216985001. The reversal of 216984959 is 959489612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216984959 - 2²⁴ = 200207743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216984959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216984919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13922 + ... + 25055.

It is an arithmetic number, because the mean of its divisors is an integer number (28648830).

Almost surely, 2^216984959 is an apocalyptic number.

216984959 is a deficient number, since it is larger than the sum of its proper divisors (12205681).

216984959 is a wasteful number, since it uses less digits than its factorization.

216984959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39289.

The product of its digits is 1399680, while the sum is 53.

The square root of 216984959 is about 14730.4093290037. The cubic root of 216984959 is about 600.9106163380.

The spelling of 216984959 in words is "two hundred sixteen million, nine hundred eighty-four thousand, nine hundred fifty-nine".