138856655 has 16 divisors (see below), whose sum is σ = 200455680. Its totient is φ = 90204192.

The previous prime is 138856651. The next prime is 138856667. The reversal of 138856655 is 556658831.

It is a cyclic number.

It is not a de Polignac number, because 138856655 - 2² = 138856651 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138856651) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 103739 + ... + 105068.

It is an arithmetic number, because the mean of its divisors is an integer number (12528480).

Almost surely, 2^138856655 is an apocalyptic number.

138856655 is a deficient number, since it is larger than the sum of its proper divisors (61599025).

138856655 is a wasteful number, since it uses less digits than its factorization.

138856655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208838.

The product of its digits is 864000, while the sum is 47.

The square root of 138856655 is about 11783.7453723339. The cubic root of 138856655 is about 517.8320179510.

The spelling of 138856655 in words is "one hundred thirty-eight million, eight hundred fifty-six thousand, six hundred fifty-five".