216307 has 8 divisors (see below), whose sum is σ = 266336. Its totient is φ = 171072.

The previous prime is 216289. The next prime is 216317. The reversal of 216307 is 703612.

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 216307 - 2⁷ = 216179 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (216317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1098 + ... + 1279.

It is an arithmetic number, because the mean of its divisors is an integer number (33292).

2²¹⁶³⁰⁷ is an apocalyptic number.

216307 is a deficient number, since it is larger than the sum of its proper divisors (50029).

216307 is a wasteful number, since it uses less digits than its factorization.

216307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 216307 is about 465.0881636851. The cubic root of 216307 is about 60.0284124693.

Adding to 216307 its reverse (703612), we get a palindrome (919919).

It can be divided in two parts, 21 and 6307, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 216307 in words is "two hundred sixteen thousand, three hundred seven".