138881792 has 72 divisors (see below), whose sum is σ = 333580800. Its totient is φ = 56374272.

The previous prime is 138881779. The next prime is 138881807. The reversal of 138881792 is 297188831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32009 + ... + 36087.

Almost surely, 2^138881792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138881792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166790400).

138881792 is an abundant number, since it is smaller than the sum of its proper divisors (194699008).

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

138881792 is an equidigital number, since it uses as much as digits as its factorization.

138881792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4121 (or 4107 counting only the distinct ones).

The product of its digits is 193536, while the sum is 47.

The square root of 138881792 is about 11784.8119204339. The cubic root of 138881792 is about 517.8632635019.

The spelling of 138881792 in words is "one hundred thirty-eight million, eight hundred eighty-one thousand, seven hundred ninety-two".