138523775 has 24 divisors (see below), whose sum is σ = 194727120. Its totient is φ = 96906240.

The previous prime is 138523753. The next prime is 138523793. The reversal of 138523775 is 577325831.

138523775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138523775 - 2⁸ = 138523519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5042 + ... + 17391.

It is an arithmetic number, because the mean of its divisors is an integer number (8113630).

Almost surely, 2^138523775 is an apocalyptic number.

138523775 is a deficient number, since it is larger than the sum of its proper divisors (56203345).

138523775 is a wasteful number, since it uses less digits than its factorization.

138523775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22475 (or 22470 counting only the distinct ones).

The product of its digits is 176400, while the sum is 41.

The square root of 138523775 is about 11769.6123555536. The cubic root of 138523775 is about 517.4178885957.

The spelling of 138523775 in words is "one hundred thirty-eight million, five hundred twenty-three thousand, seven hundred seventy-five".