243213340 has 48 divisors (see below), whose sum is σ = 526901760. Its totient is φ = 94256960.

The previous prime is 243213329. The next prime is 243213359. The reversal of 243213340 is 43312342.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82329 + ... + 85231.

It is an arithmetic number, because the mean of its divisors is an integer number (10977120).

Almost surely, 2^243213340 is an apocalyptic number.

243213340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243213340 is an abundant number, since it is smaller than the sum of its proper divisors (283688420).

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

243213340 is a wasteful number, since it uses less digits than its factorization.

243213340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042 (or 3040 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 243213340 is about 15595.2986505549. The cubic root of 243213340 is about 624.2077128742.

Adding to 243213340 its reverse (43312342), we get a palindrome (286525682).

The spelling of 243213340 in words is "two hundred forty-three million, two hundred thirteen thousand, three hundred forty".