138808832 has 60 divisors (see below), whose sum is σ = 293101776. Its totient is φ = 65664000.

The previous prime is 138808823. The next prime is 138808883. The reversal of 138808832 is 238808831.

It is a self number, because there is not a number n which added to its sum of digits gives 138808832.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184457 + ... + 185207.

Almost surely, 2^138808832 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 138808832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146550888).

138808832 is an abundant number, since it is smaller than the sum of its proper divisors (154292944).

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

138808832 is an frugal number, since it uses more digits than its factorization.

138808832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 138808832 is about 11781.7160040463. The cubic root of 138808832 is about 517.7725630545.

Subtracting 138808832 from its reverse (238808831), we obtain a palindrome (99999999).

The spelling of 138808832 in words is "one hundred thirty-eight million, eight hundred eight thousand, eight hundred thirty-two".