138595668 has 48 divisors (see below), whose sum is σ = 340967424. Its totient is φ = 43751520.

The previous prime is 138595657. The next prime is 138595697. The reversal of 138595668 is 866595831.

It is a self number, because there is not a number n which added to its sum of digits gives 138595668.

It is a congruent number.

It is an unprimeable number.

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, 13521 + ... + 21447.

It is an arithmetic number, because the mean of its divisors is an integer number (7103488).

Almost surely, 2^138595668 is an apocalyptic number.

It is an amenable number.

138595668 is an abundant number, since it is smaller than the sum of its proper divisors (202371756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138595668 is a wasteful number, since it uses less digits than its factorization.

138595668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8012 (or 8010 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 51.

The square root of 138595668 is about 11772.6661381354. Note that the first 3 decimals coincide. The cubic root of 138595668 is about 517.5073853645.

The spelling of 138595668 in words is "one hundred thirty-eight million, five hundred ninety-five thousand, six hundred sixty-eight".