138305044 has 6 divisors (see below), whose sum is σ = 242033834. Its totient is φ = 69152520.

The previous prime is 138305029. The next prime is 138305053. The reversal of 138305044 is 440503831.

138305044 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 83722500 + 54582544 = 9150^2 + 7388^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 17288127 + ... + 17288134.

Almost surely, 2^138305044 is an apocalyptic number.

It is an amenable number.

138305044 is a deficient number, since it is larger than the sum of its proper divisors (103728790).

138305044 is a wasteful number, since it uses less digits than its factorization.

138305044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34576265 (or 34576263 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 138305044 is about 11760.3164923398. The cubic root of 138305044 is about 517.1454084071.

Adding to 138305044 its reverse (440503831), we get a palindrome (578808875).

The spelling of 138305044 in words is "one hundred thirty-eight million, three hundred five thousand, forty-four".