138905383 has 4 divisors (see below), whose sum is σ = 139603600. Its totient is φ = 138207168.

The previous prime is 138905359. The next prime is 138905387. The reversal of 138905383 is 383509831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138905383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138905387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348810 + ... + 349207.

It is an arithmetic number, because the mean of its divisors is an integer number (34900900).

Almost surely, 2^138905383 is an apocalyptic number.

138905383 is a deficient number, since it is larger than the sum of its proper divisors (698217).

138905383 is an equidigital number, since it uses as much as digits as its factorization.

138905383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698216.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 138905383 is about 11785.8127848698. The cubic root of 138905383 is about 517.8925839295.

The spelling of 138905383 in words is "one hundred thirty-eight million, nine hundred five thousand, three hundred eighty-three".