138531075 has 24 divisors (see below), whose sum is σ = 229741248. Its totient is φ = 73656480.

The previous prime is 138531073. The next prime is 138531089. The reversal of 138531075 is 570135831.

It is not a de Polignac number, because 138531075 - 2¹ = 138531073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138531073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23364 + ... + 28686.

It is an arithmetic number, because the mean of its divisors is an integer number (9572552).

Almost surely, 2^138531075 is an apocalyptic number.

138531075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138531075 is a deficient number, since it is larger than the sum of its proper divisors (91210173).

138531075 is a wasteful number, since it uses less digits than its factorization.

138531075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5683 (or 5678 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 138531075 is about 11769.9224721321. The cubic root of 138531075 is about 517.4269774909.

The spelling of 138531075 in words is "one hundred thirty-eight million, five hundred thirty-one thousand, seventy-five".