138969392 has 40 divisors (see below), whose sum is σ = 283843440. Its totient is φ = 65811200.

The previous prime is 138969379. The next prime is 138969403. The reversal of 138969392 is 293969831.

It is a self number, because there is not a number n which added to its sum of digits gives 138969392.

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 7 ways as a sum of consecutive naturals, for example, 21767 + ... + 27417.

It is an arithmetic number, because the mean of its divisors is an integer number (7096086).

Almost surely, 2^138969392 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 138969392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141921720).

138969392 is an abundant number, since it is smaller than the sum of its proper divisors (144874048).

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

138969392 is a wasteful number, since it uses less digits than its factorization.

138969392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5741 (or 5735 counting only the distinct ones).

The product of its digits is 629856, while the sum is 50.

The square root of 138969392 is about 11788.5279827466. The cubic root of 138969392 is about 517.9721217536.

The spelling of 138969392 in words is "one hundred thirty-eight million, nine hundred sixty-nine thousand, three hundred ninety-two".