243400520520 has 48 divisors (see below), whose sum is σ = 791051692860. Its totient is φ = 64906805376.

The previous prime is 243400520477. The next prime is 243400520533. The reversal of 243400520520 is 25025004342.

It is a happy number.

243400520520 is a `hidden beast` number, since 2 + 434 + 0 + 0 + 5 + 205 + 20 = 666.

243400520520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 208587677796 + 34812842724 = 456714^2 + 186582^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338055919 + ... + 338056638.

Almost surely, 2^243400520520 is an apocalyptic number.

243400520520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243400520520 is an abundant number, since it is smaller than the sum of its proper divisors (547651172340).

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

243400520520 is a wasteful number, since it uses less digits than its factorization.

243400520520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676112574 (or 676112567 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

Adding to 243400520520 its reverse (25025004342), we get a palindrome (268425524862).

The spelling of 243400520520 in words is "two hundred forty-three billion, four hundred million, five hundred twenty thousand, five hundred twenty".