138689607 has 32 divisors (see below), whose sum is σ = 223736320. Its totient is φ = 74649600.

The previous prime is 138689599. The next prime is 138689623. The reversal of 138689607 is 706986831.

It is not a de Polignac number, because 138689607 - 2³ = 138689599 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 (138689627) 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 31 ways as a sum of consecutive naturals, for example, 76107 + ... + 77907.

It is an arithmetic number, because the mean of its divisors is an integer number (6991760).

Almost surely, 2^138689607 is an apocalyptic number.

138689607 is a deficient number, since it is larger than the sum of its proper divisors (85046713).

138689607 is a wasteful number, since it uses less digits than its factorization.

138689607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 138689607 is about 11776.6551702935. The cubic root of 138689607 is about 517.6242797035.

The spelling of 138689607 in words is "one hundred thirty-eight million, six hundred eighty-nine thousand, six hundred seven".