243109440 has 336 divisors, whose sum is σ = 989015040. Its totient is φ = 53637120.

The previous prime is 243109439. The next prime is 243109453. The reversal of 243109440 is 44901342.

243109440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×243109440² = 118204399634227200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 624766 + ... + 625154.

Almost surely, 2^243109440 is an apocalyptic number.

243109440 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 243109440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (494507520).

243109440 is an abundant number, since it is smaller than the sum of its proper divisors (745905600).

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

243109440 is a wasteful number, since it uses less digits than its factorization.

243109440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 243109440 is about 15591.9671626129. The cubic root of 243109440 is about 624.1188136676.

The spelling of 243109440 in words is "two hundred forty-three million, one hundred nine thousand, four hundred forty".