243939954240 has 448 divisors, whose sum is σ = 937113696000. Its totient is φ = 59500707840.

The previous prime is 243939954239. The next prime is 243939954253. The reversal of 243939954240 is 42459939342.

243939954240 is a `hidden beast` number, since 2 + 4 + 3 + 9 + 3 + 99 + 542 + 4 + 0 = 666.

It is a super-2 number, since 2×243939954240² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4735020 + ... + 4786260.

Almost surely, 2^243939954240 is an apocalyptic number.

243939954240 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 243939954240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (468556848000).

243939954240 is an abundant number, since it is smaller than the sum of its proper divisors (693173741760).

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

243939954240 is a wasteful number, since it uses less digits than its factorization.

243939954240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51315 (or 51299 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 243939954240 in words is "two hundred forty-three billion, nine hundred thirty-nine million, nine hundred fifty-four thousand, two hundred forty".