138873730638 has 8 divisors (see below), whose sum is σ = 277747461288. Its totient is φ = 46291243544.

The previous prime is 138873730621. The next prime is 138873730673. The reversal of 138873730638 is 836037378831.

It is a sphenic number, since it is the product of 3 distinct primes.

138873730638 is an admirable number.

It is a super-2 number, since 2×138873730638² (a number of 23 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 11572810881 + ... + 11572810892.

It is an arithmetic number, because the mean of its divisors is an integer number (34718432661).

Almost surely, 2^138873730638 is an apocalyptic number.

138873730638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138873730638 is a wasteful number, since it uses less digits than its factorization.

138873730638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23145621778.

The product of its (nonzero) digits is 12192768, while the sum is 57.

The spelling of 138873730638 in words is "one hundred thirty-eight billion, eight hundred seventy-three million, seven hundred thirty thousand, six hundred thirty-eight".