138775375 has 32 divisors (see below), whose sum is σ = 182108160. Its totient is φ = 105444000.

The previous prime is 138775367. The next prime is 138775379. The reversal of 138775375 is 573577831.

It is a happy number.

It is not a de Polignac number, because 138775375 - 2³ = 138775367 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138775379) 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 31 ways as a sum of consecutive naturals, for example, 228322 + ... + 228928.

It is an arithmetic number, because the mean of its divisors is an integer number (5690880).

Almost surely, 2^138775375 is an apocalyptic number.

138775375 is a deficient number, since it is larger than the sum of its proper divisors (43332785).

138775375 is an equidigital number, since it uses as much as digits as its factorization.

138775375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712 (or 702 counting only the distinct ones).

The product of its digits is 617400, while the sum is 46.

The square root of 138775375 is about 11780.2960489115. The cubic root of 138775375 is about 517.7309602536.

The spelling of 138775375 in words is "one hundred thirty-eight million, seven hundred seventy-five thousand, three hundred seventy-five".