138027689 has 16 divisors (see below), whose sum is σ = 144938640. Its totient is φ = 131328000.

The previous prime is 138027683. The next prime is 138027691. The reversal of 138027689 is 986720831.

It can be written as a sum of positive squares in 8 ways, for example, as 5017600 + 133010089 = 2240^2 + 11533^2 .

It is a cyclic number.

It is not a de Polignac number, because 138027689 - 2⁸ = 138027433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138027683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 572609 + ... + 572849.

It is an arithmetic number, because the mean of its divisors is an integer number (9058665).

Almost surely, 2^138027689 is an apocalyptic number.

It is an amenable number.

138027689 is a deficient number, since it is larger than the sum of its proper divisors (6910951).

138027689 is a wasteful number, since it uses less digits than its factorization.

138027689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 138027689 is about 11748.5185874645. The cubic root of 138027689 is about 516.7994850120.

The spelling of 138027689 in words is "one hundred thirty-eight million, twenty-seven thousand, six hundred eighty-nine".