243443440 has 40 divisors (see below), whose sum is σ = 575610480. Its totient is φ = 95725056.

The previous prime is 243443437. The next prime is 243443441. The reversal of 243443440 is 44344342.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 243443399 and 243443408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243443441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21069 + ... + 30508.

It is an arithmetic number, because the mean of its divisors is an integer number (14390262).

Almost surely, 2^243443440 is an apocalyptic number.

243443440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243443440 is an abundant number, since it is smaller than the sum of its proper divisors (332167040).

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

243443440 is a wasteful number, since it uses less digits than its factorization.

243443440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51649 (or 51643 counting only the distinct ones).

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

The square root of 243443440 is about 15602.6741297766. The cubic root of 243443440 is about 624.4045015908.

Adding to 243443440 its reverse (44344342), we get a palindrome (287787782).

The spelling of 243443440 in words is "two hundred forty-three million, four hundred forty-three thousand, four hundred forty".