243042240 has 224 divisors, whose sum is σ = 898306560. Its totient is φ = 54521856.

The previous prime is 243042229. The next prime is 243042257. The reversal of 243042240 is 42240342.

243042240 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 (224).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396174 + ... + 396786.

Almost surely, 2^243042240 is an apocalyptic number.

243042240 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 243042240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (449153280).

243042240 is an abundant number, since it is smaller than the sum of its proper divisors (655264320).

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

243042240 is a wasteful number, since it uses less digits than its factorization.

243042240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 243042240 is about 15589.8120578793. The cubic root of 243042240 is about 624.0613023272.

Adding to 243042240 its reverse (42240342), we get a palindrome (285282582).

The spelling of 243042240 in words is "two hundred forty-three million, forty-two thousand, two hundred forty".