138688356 has 12 divisors (see below), whose sum is σ = 323606192. Its totient is φ = 46229448.

The previous prime is 138688349. The next prime is 138688423. The reversal of 138688356 is 653886831.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 5778670 + ... + 5778693.

Almost surely, 2^138688356 is an apocalyptic number.

It is an amenable number.

138688356 is an abundant number, since it is smaller than the sum of its proper divisors (184917836).

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

138688356 is a wasteful number, since it uses less digits than its factorization.

138688356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11557370 (or 11557368 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The square root of 138688356 is about 11776.6020566206. The cubic root of 138688356 is about 517.6227233506.

The spelling of 138688356 in words is "one hundred thirty-eight million, six hundred eighty-eight thousand, three hundred fifty-six".