243215216 has 20 divisors (see below), whose sum is σ = 471761472. Its totient is φ = 121470336.

The previous prime is 243215201. The next prime is 243215221. The reversal of 243215216 is 612512342.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6881 + ... + 23103.

Almost surely, 2^243215216 is an apocalyptic number.

It is an amenable number.

243215216 is a deficient number, since it is larger than the sum of its proper divisors (228546256).

243215216 is a wasteful number, since it uses less digits than its factorization.

243215216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17168 (or 17162 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 243215216 is about 15595.3587967703. The cubic root of 243215216 is about 624.2093177898.

Adding to 243215216 its reverse (612512342), we get a palindrome (855727558).

The spelling of 243215216 in words is "two hundred forty-three million, two hundred fifteen thousand, two hundred sixteen".