243216340 has 24 divisors (see below), whose sum is σ = 537636960. Its totient is φ = 92166048.

The previous prime is 243216313. The next prime is 243216353. The reversal of 243216340 is 43612342.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319642 + ... + 320401.

It is an arithmetic number, because the mean of its divisors is an integer number (22401540).

Almost surely, 2^243216340 is an apocalyptic number.

243216340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243216340 is an abundant number, since it is smaller than the sum of its proper divisors (294420620).

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

243216340 is a wasteful number, since it uses less digits than its factorization.

243216340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640071 (or 640069 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 243216340 is about 15595.3948330910. The cubic root of 243216340 is about 624.2102793664.

Adding to 243216340 its reverse (43612342), we get a palindrome (286828682).

The spelling of 243216340 in words is "two hundred forty-three million, two hundred sixteen thousand, three hundred forty".