243440320 has 56 divisors (see below), whose sum is σ = 581101200. Its totient is φ = 97139712.

The previous prime is 243440311. The next prime is 243440321. The reversal of 243440320 is 23044342.

It is a junction number, because it is equal to n+sod(n) for n = 243440291 and 243440300.

It is not an unprimeable number, because it can be changed into a prime (243440321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197466 + ... + 198694.

Almost surely, 2^243440320 is an apocalyptic number.

243440320 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 243440320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290550600).

243440320 is an abundant number, since it is smaller than the sum of its proper divisors (337660880).

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

243440320 is a wasteful number, since it uses less digits than its factorization.

243440320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865 (or 1855 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 243440320 is about 15602.5741465952. The cubic root of 243440320 is about 624.4018340987.

Adding to 243440320 its reverse (23044342), we get a palindrome (266484662).

The spelling of 243440320 in words is "two hundred forty-three million, four hundred forty thousand, three hundred twenty".