138076709 has 4 divisors (see below), whose sum is σ = 138777804. Its totient is φ = 137375616.

The previous prime is 138076699. The next prime is 138076721. The reversal of 138076709 is 907670831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 98109025 + 39967684 = 9905^2 + 6322^2 .

It is a cyclic number.

It is not a de Polignac number, because 138076709 - 2¹⁶ = 138011173 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 (138076739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350252 + ... + 350645.

It is an arithmetic number, because the mean of its divisors is an integer number (34694451).

Almost surely, 2^138076709 is an apocalyptic number.

It is an amenable number.

138076709 is a deficient number, since it is larger than the sum of its proper divisors (701095).

138076709 is an equidigital number, since it uses as much as digits as its factorization.

138076709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701094.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 138076709 is about 11750.6046227418. The cubic root of 138076709 is about 516.8606575504.

The spelling of 138076709 in words is "one hundred thirty-eight million, seventy-six thousand, seven hundred nine".