216986729 has 8 divisors (see below), whose sum is σ = 229690560. Its totient is φ = 204631056.

The previous prime is 216986711. The next prime is 216986743. The reversal of 216986729 is 927689612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216986729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216986779) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 85757 + ... + 88250.

It is an arithmetic number, because the mean of its divisors is an integer number (28711320).

Almost surely, 2^216986729 is an apocalyptic number.

216986729 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

216986729 is a deficient number, since it is larger than the sum of its proper divisors (12703831).

216986729 is a wasteful number, since it uses less digits than its factorization.

216986729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174079.

The product of its digits is 653184, while the sum is 50.

The square root of 216986729 is about 14730.4694086781. The cubic root of 216986729 is about 600.9122502591.

The spelling of 216986729 in words is "two hundred sixteen million, nine hundred eighty-six thousand, seven hundred twenty-nine".