138293205686 has 8 divisors (see below), whose sum is σ = 207446829840. Its totient is φ = 69144262408.

The previous prime is 138293205613. The next prime is 138293205691. The reversal of 138293205686 is 686502392831.

138293205686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1095401 + ... + 1215108.

It is an arithmetic number, because the mean of its divisors is an integer number (25930853730).

Almost surely, 2^138293205686 is an apocalyptic number.

138293205686 is a deficient number, since it is larger than the sum of its proper divisors (69153624154).

138293205686 is a wasteful number, since it uses less digits than its factorization.

138293205686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340438.

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 138293205686 in words is "one hundred thirty-eight billion, two hundred ninety-three million, two hundred five thousand, six hundred eighty-six".