216309243 has 8 divisors (see below), whose sum is σ = 303592000. Its totient is φ = 136616328.

The previous prime is 216309229. The next prime is 216309251. The reversal of 216309243 is 342903612.

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

It is not a de Polignac number, because 216309243 - 2⁵ = 216309211 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 216309243.

It is not an unprimeable number, because it can be changed into a prime (216309283) 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, 1897393 + ... + 1897506.

It is an arithmetic number, because the mean of its divisors is an integer number (37949000).

Almost surely, 2^216309243 is an apocalyptic number.

216309243 is a deficient number, since it is larger than the sum of its proper divisors (87282757).

216309243 is a wasteful number, since it uses less digits than its factorization.

216309243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3794921.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 216309243 is about 14707.4553543433. The cubic root of 216309243 is about 600.2861995724.

The spelling of 216309243 in words is "two hundred sixteen million, three hundred nine thousand, two hundred forty-three".