138688366 has 8 divisors (see below), whose sum is σ = 209410704. Its totient is φ = 68884800.

The previous prime is 138688349. The next prime is 138688423. The reversal of 138688366 is 663886831.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229315 + ... + 229918.

It is an arithmetic number, because the mean of its divisors is an integer number (26176338).

Almost surely, 2^138688366 is an apocalyptic number.

138688366 is a deficient number, since it is larger than the sum of its proper divisors (70722338).

138688366 is a wasteful number, since it uses less digits than its factorization.

138688366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459386.

The product of its digits is 995328, while the sum is 49.

The square root of 138688366 is about 11776.6024811913. The cubic root of 138688366 is about 517.6227357915.

The spelling of 138688366 in words is "one hundred thirty-eight million, six hundred eighty-eight thousand, three hundred sixty-six".