138887656 has 8 divisors (see below), whose sum is σ = 260414370. Its totient is φ = 69443824.

The previous prime is 138887653. The next prime is 138887681. The reversal of 138887656 is 656788831.

It can be written as a sum of positive squares in only one way, i.e., 138438756 + 448900 = 11766^2 + 670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (138887653) 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 as a sum of consecutive naturals, namely, 8680471 + ... + 8680486.

Almost surely, 2^138887656 is an apocalyptic number.

It is an amenable number.

138887656 is a deficient number, since it is larger than the sum of its proper divisors (121526714).

138887656 is a wasteful number, since it uses less digits than its factorization.

138887656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17360963 (or 17360959 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The square root of 138887656 is about 11785.0607126141. The cubic root of 138887656 is about 517.8705519721.

The spelling of 138887656 in words is "one hundred thirty-eight million, eight hundred eighty-seven thousand, six hundred fifty-six".