138027709 has 8 divisors (see below), whose sum is σ = 146622528. Its totient is φ = 129485760.

The previous prime is 138027691. The next prime is 138027713. The reversal of 138027709 is 907720831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138027709 - 2⁵ = 138027677 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 (138027749) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 7767 + ... + 18340.

It is an arithmetic number, because the mean of its divisors is an integer number (18327816).

Almost surely, 2^138027709 is an apocalyptic number.

It is an amenable number.

138027709 is a deficient number, since it is larger than the sum of its proper divisors (8594819).

138027709 is a wasteful number, since it uses less digits than its factorization.

138027709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26435.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 138027709 is about 11748.5194386357. The cubic root of 138027709 is about 516.7995099732.

The spelling of 138027709 in words is "one hundred thirty-eight million, twenty-seven thousand, seven hundred nine".