138688574 has 16 divisors (see below), whose sum is σ = 217479168. Its totient is φ = 66206712.

The previous prime is 138688559. The next prime is 138688577. The reversal of 138688574 is 475886831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138688577) 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 7 ways as a sum of consecutive naturals, for example, 25439 + ... + 30405.

It is an arithmetic number, because the mean of its divisors is an integer number (13592448).

Almost surely, 2^138688574 is an apocalyptic number.

138688574 is a deficient number, since it is larger than the sum of its proper divisors (78790594).

138688574 is a wasteful number, since it uses less digits than its factorization.

138688574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5599.

The product of its digits is 1290240, while the sum is 50.

The square root of 138688574 is about 11776.6113122579. The cubic root of 138688574 is about 517.6229945622.

The spelling of 138688574 in words is "one hundred thirty-eight million, six hundred eighty-eight thousand, five hundred seventy-four".