138144805 has 16 divisors (see below), whose sum is σ = 176428800. Its totient is φ = 103479552.

The previous prime is 138144779. The next prime is 138144817. The reversal of 138144805 is 508441831.

138144805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 138144805 - 2¹⁹ = 137620517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12832 + ... + 20998.

It is an arithmetic number, because the mean of its divisors is an integer number (11026800).

Almost surely, 2^138144805 is an apocalyptic number.

It is an amenable number.

138144805 is a deficient number, since it is larger than the sum of its proper divisors (38283995).

138144805 is a wasteful number, since it uses less digits than its factorization.

138144805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8388.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 138144805 is about 11753.5018186071. The cubic root of 138144805 is about 516.9456111950.

The spelling of 138144805 in words is "one hundred thirty-eight million, one hundred forty-four thousand, eight hundred five".