243203240440 has 16 divisors (see below), whose sum is σ = 547207291080. Its totient is φ = 97281296160.

The previous prime is 243203240429. The next prime is 243203240477. The reversal of 243203240440 is 44042302342.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 243203240399 and 243203240408.

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, 3040040466 + ... + 3040040545.

Almost surely, 2^243203240440 is an apocalyptic number.

243203240440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243203240440 is an abundant number, since it is smaller than the sum of its proper divisors (304004050640).

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

243203240440 is a wasteful number, since it uses less digits than its factorization.

243203240440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6080081022 (or 6080081018 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 243203240440 its reverse (44042302342), we get a palindrome (287245542782).

The spelling of 243203240440 in words is "two hundred forty-three billion, two hundred three million, two hundred forty thousand, four hundred forty".