138405139 has 16 divisors (see below), whose sum is σ = 151488000. Its totient is φ = 125949600.

The previous prime is 138405131. The next prime is 138405167. The reversal of 138405139 is 931504831.

It is a cyclic number.

It is not a de Polignac number, because 138405139 - 2³ = 138405131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138405131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131164 + ... + 132214.

It is an arithmetic number, because the mean of its divisors is an integer number (9468000).

Almost surely, 2^138405139 is an apocalyptic number.

138405139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138405139 is a deficient number, since it is larger than the sum of its proper divisors (13082861).

138405139 is a wasteful number, since it uses less digits than its factorization.

138405139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 138405139 is about 11764.5713479072. The cubic root of 138405139 is about 517.2701355696.

The spelling of 138405139 in words is "one hundred thirty-eight million, four hundred five thousand, one hundred thirty-nine".