138125775 has 24 divisors (see below), whose sum is σ = 230945040. Its totient is φ = 72835840.

The previous prime is 138125749. The next prime is 138125789. The reversal of 138125775 is 577521831.

It is not a de Polignac number, because 138125775 - 2¹⁶ = 138060239 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, 3672 + ... + 17021.

It is an arithmetic number, because the mean of its divisors is an integer number (9622710).

Almost surely, 2^138125775 is an apocalyptic number.

138125775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138125775 is a deficient number, since it is larger than the sum of its proper divisors (92819265).

138125775 is a wasteful number, since it uses less digits than its factorization.

138125775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20795 (or 20790 counting only the distinct ones).

The product of its digits is 58800, while the sum is 39.

The square root of 138125775 is about 11752.6922447582. The cubic root of 138125775 is about 516.9218729957.

The spelling of 138125775 in words is "one hundred thirty-eight million, one hundred twenty-five thousand, seven hundred seventy-five".