138634508 has 6 divisors (see below), whose sum is σ = 242610396. Its totient is φ = 69317252.

The previous prime is 138634487. The next prime is 138634553. The reversal of 138634508 is 805436831.

138634508 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17329310 + ... + 17329317.

It is an arithmetic number, because the mean of its divisors is an integer number (40435066).

Almost surely, 2^138634508 is an apocalyptic number.

It is an amenable number.

138634508 is a deficient number, since it is larger than the sum of its proper divisors (103975888).

138634508 is a wasteful number, since it uses less digits than its factorization.

138634508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34658631 (or 34658629 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 138634508 is about 11774.3156064376. The cubic root of 138634508 is about 517.5557228771. Note that the first 3 decimals are identical.

The spelling of 138634508 in words is "one hundred thirty-eight million, six hundred thirty-four thousand, five hundred eight".