138597975 has 36 divisors (see below), whose sum is σ = 249128152. Its totient is φ = 73656000.

The previous prime is 138597973. The next prime is 138597997. The reversal of 138597975 is 579795831.

It is not a de Polignac number, because 138597975 - 2¹ = 138597973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138597973) 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 35 ways as a sum of consecutive naturals, for example, 73545 + ... + 75405.

Almost surely, 2^138597975 is an apocalyptic number.

138597975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138597975 is a deficient number, since it is larger than the sum of its proper divisors (110530177).

138597975 is a wasteful number, since it uses less digits than its factorization.

138597975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208 (or 2200 counting only the distinct ones).

The product of its digits is 2381400, while the sum is 54.

The square root of 138597975 is about 11772.7641189315. The cubic root of 138597975 is about 517.5102567455.

The spelling of 138597975 in words is "one hundred thirty-eight million, five hundred ninety-seven thousand, nine hundred seventy-five".