243647739138 has 32 divisors (see below), whose sum is σ = 489837300480. Its totient is φ = 80792391680.

The previous prime is 243647739121. The next prime is 243647739217. The reversal of 243647739138 is 831937746342.

243647739138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16636423 + ... + 16651061.

It is an arithmetic number, because the mean of its divisors is an integer number (15307415640).

Almost surely, 2^243647739138 is an apocalyptic number.

243647739138 is an abundant number, since it is smaller than the sum of its proper divisors (246189561342).

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

243647739138 is a wasteful number, since it uses less digits than its factorization.

243647739138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28922.

The product of its digits is 18289152, while the sum is 57.

The spelling of 243647739138 in words is "two hundred forty-three billion, six hundred forty-seven million, seven hundred thirty-nine thousand, one hundred thirty-eight".