138438317980 has 24 divisors (see below), whose sum is σ = 290734068240. Its totient is φ = 55372736640.

The previous prime is 138438317977. The next prime is 138438318017. The reversal of 138438317980 is 89713834831.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 309816 + ... + 610624.

It is an arithmetic number, because the mean of its divisors is an integer number (12113919510).

Almost surely, 2^138438317980 is an apocalyptic number.

138438317980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138438317980 is an abundant number, since it is smaller than the sum of its proper divisors (152295750260).

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

138438317980 is a wasteful number, since it uses less digits than its factorization.

138438317980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323829 (or 323827 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 138438317980 in words is "one hundred thirty-eight billion, four hundred thirty-eight million, three hundred seventeen thousand, nine hundred eighty".