243205340 has 96 divisors (see below), whose sum is σ = 604195200. Its totient is φ = 80510976.

The previous prime is 243205337. The next prime is 243205343. The reversal of 243205340 is 43502342.

243205340 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (243205337) and next prime (243205343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243205343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 541436 + ... + 541884.

It is an arithmetic number, because the mean of its divisors is an integer number (6293700).

Almost surely, 2^243205340 is an apocalyptic number.

243205340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243205340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302097600).

243205340 is an abundant number, since it is smaller than the sum of its proper divisors (360989860).

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

243205340 is a wasteful number, since it uses less digits than its factorization.

243205340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 243205340 is about 15595.0421608920. The cubic root of 243205340 is about 624.2008687917.

Adding to 243205340 its reverse (43502342), we get a palindrome (286707682).

The spelling of 243205340 in words is "two hundred forty-three million, two hundred five thousand, three hundred forty".