243978240 has 312 divisors, whose sum is σ = 898782048. Its totient is φ = 56033280.

The previous prime is 243978233. The next prime is 243978283. The reversal of 243978240 is 42879342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12840951 + ... + 12840969.

Almost surely, 2^243978240 is an apocalyptic number.

243978240 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 243978240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (449391024).

243978240 is an abundant number, since it is smaller than the sum of its proper divisors (654803808).

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

243978240 is a wasteful number, since it uses less digits than its factorization.

243978240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 243978240 is about 15619.8028156568. The cubic root of 243978240 is about 624.8614007333.

The spelling of 243978240 in words is "two hundred forty-three million, nine hundred seventy-eight thousand, two hundred forty".