138238239252 has 72 divisors (see below), whose sum is σ = 332049122496. Its totient is φ = 44735376000.

The previous prime is 138238239247. The next prime is 138238239253. The reversal of 138238239252 is 252932832831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138238239253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21901177 + ... + 21907487.

It is an arithmetic number, because the mean of its divisors is an integer number (4611793368).

Almost surely, 2^138238239252 is an apocalyptic number.

138238239252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138238239252 is an abundant number, since it is smaller than the sum of its proper divisors (193810883244).

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

138238239252 is a wasteful number, since it uses less digits than its factorization.

138238239252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6781 (or 6568 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 48.

The spelling of 138238239252 in words is "one hundred thirty-eight billion, two hundred thirty-eight million, two hundred thirty-nine thousand, two hundred fifty-two".