138338005 has 32 divisors (see below), whose sum is σ = 185812704. Its totient is φ = 98205696.

The previous prime is 138337987. The next prime is 138338029. The reversal of 138338005 is 500833831.

It can be written as a sum of positive squares in 16 ways, for example, as 20875761 + 117462244 = 4569^2 + 10838^2 .

It is not a de Polignac number, because 138338005 - 2¹¹ = 138335957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232989 + ... + 233581.

It is an arithmetic number, because the mean of its divisors is an integer number (5806647).

Almost surely, 2^138338005 is an apocalyptic number.

It is an amenable number.

138338005 is a deficient number, since it is larger than the sum of its proper divisors (47474699).

138338005 is a wasteful number, since it uses less digits than its factorization.

138338005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 138338005 is about 11761.7177742029. The cubic root of 138338005 is about 517.1864873521.

The spelling of 138338005 in words is "one hundred thirty-eight million, three hundred thirty-eight thousand, five".