243213656 has 48 divisors (see below), whose sum is σ = 535818240. Its totient is φ = 103185600.

The previous prime is 243213653. The next prime is 243213671. The reversal of 243213656 is 656312342.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243213653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36521 + ... + 42663.

It is an arithmetic number, because the mean of its divisors is an integer number (11162880).

Almost surely, 2^243213656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243213656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267909120).

243213656 is an abundant number, since it is smaller than the sum of its proper divisors (292604584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243213656 is a wasteful number, since it uses less digits than its factorization.

243213656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6264 (or 6253 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 243213656 is about 15595.3087818100. The cubic root of 243213656 is about 624.2079832123.

Adding to 243213656 its reverse (656312342), we get a palindrome (899525998).

The spelling of 243213656 in words is "two hundred forty-three million, two hundred thirteen thousand, six hundred fifty-six".