138506038 has 48 divisors (see below), whose sum is σ = 244590192. Its totient is φ = 58572800.

The previous prime is 138506033. The next prime is 138506111. The reversal of 138506038 is 830605831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 138505994 and 138506012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138506033) 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 23 ways as a sum of consecutive naturals, for example, 538806 + ... + 539062.

It is an arithmetic number, because the mean of its divisors is an integer number (5095629).

Almost surely, 2^138506038 is an apocalyptic number.

138506038 is a deficient number, since it is larger than the sum of its proper divisors (106084154).

138506038 is a wasteful number, since it uses less digits than its factorization.

138506038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 138506038 is about 11768.8588231825. The cubic root of 138506038 is about 517.3958037398.

The spelling of 138506038 in words is "one hundred thirty-eight million, five hundred six thousand, thirty-eight".