243400504520 has 128 divisors (see below), whose sum is σ = 565951276800. Its totient is φ = 94166016000.

The previous prime is 243400504519. The next prime is 243400504531. The reversal of 243400504520 is 25405004342.

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, 100702352 + ... + 100704768.

It is an arithmetic number, because the mean of its divisors is an integer number (4421494350).

Almost surely, 2^243400504520 is an apocalyptic number.

243400504520 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 243400504520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282975638400).

243400504520 is an abundant number, since it is smaller than the sum of its proper divisors (322550772280).

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

243400504520 is a wasteful number, since it uses less digits than its factorization.

243400504520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3159 (or 3155 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 29.

Adding to 243400504520 its reverse (25405004342), we get a palindrome (268805508862).

The spelling of 243400504520 in words is "two hundred forty-three billion, four hundred million, five hundred four thousand, five hundred twenty".