138689738 has 8 divisors (see below), whose sum is σ = 226946880. Its totient is φ = 63040780.

The previous prime is 138689731. The next prime is 138689743. The reversal of 138689738 is 837986831.

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

It is a self number, because there is not a number n which added to its sum of digits gives 138689738.

It is not an unprimeable number, because it can be changed into a prime (138689731) 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 3 ways as a sum of consecutive naturals, for example, 3152018 + ... + 3152061.

It is an arithmetic number, because the mean of its divisors is an integer number (28368360).

Almost surely, 2^138689738 is an apocalyptic number.

138689738 is a deficient number, since it is larger than the sum of its proper divisors (88257142).

138689738 is a wasteful number, since it uses less digits than its factorization.

138689738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6304092.

The product of its digits is 1741824, while the sum is 53.

The square root of 138689738 is about 11776.6607321430. The cubic root of 138689738 is about 517.6244426784.

The spelling of 138689738 in words is "one hundred thirty-eight million, six hundred eighty-nine thousand, seven hundred thirty-eight".