138138775 has 12 divisors (see below), whose sum is σ = 172254600. Its totient is φ = 109890080.

The previous prime is 138138743. The next prime is 138138779. The reversal of 138138775 is 577831831.

It is not a de Polignac number, because 138138775 - 2⁵ = 138138743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138138779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10960 + ... + 19909.

It is an arithmetic number, because the mean of its divisors is an integer number (14354550).

Almost surely, 2^138138775 is an apocalyptic number.

138138775 is a deficient number, since it is larger than the sum of its proper divisors (34115825).

138138775 is a wasteful number, since it uses less digits than its factorization.

138138775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31058 (or 31053 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 138138775 is about 11753.2452965128. The cubic root of 138138775 is about 516.9380895528.

The spelling of 138138775 in words is "one hundred thirty-eight million, one hundred thirty-eight thousand, seven hundred seventy-five".