216929305 has 8 divisors (see below), whose sum is σ = 260641800. Its totient is φ = 173325696.

The previous prime is 216929287. The next prime is 216929369. The reversal of 216929305 is 503929612.

It can be written as a sum of positive squares in 4 ways, for example, as 114575616 + 102353689 = 10704^2 + 10117^2 .

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 216929305 - 2⁷ = 216929177 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22770 + ... + 30859.

It is an arithmetic number, because the mean of its divisors is an integer number (32580225).

Almost surely, 2^216929305 is an apocalyptic number.

It is an amenable number.

216929305 is a deficient number, since it is larger than the sum of its proper divisors (43712495).

216929305 is an equidigital number, since it uses as much as digits as its factorization.

216929305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54443.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 216929305 is about 14728.5201225378. The cubic root of 216929305 is about 600.8592365262.

The spelling of 216929305 in words is "two hundred sixteen million, nine hundred twenty-nine thousand, three hundred five".