138991175 has 24 divisors (see below), whose sum is σ = 184876560. Its totient is φ = 103334400.

The previous prime is 138991163. The next prime is 138991199. The reversal of 138991175 is 571199831.

It is not a de Polignac number, because 138991175 - 2⁸ = 138990919 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, 22415 + ... + 27935.

It is an arithmetic number, because the mean of its divisors is an integer number (7703190).

Almost surely, 2^138991175 is an apocalyptic number.

138991175 is a deficient number, since it is larger than the sum of its proper divisors (45885385).

138991175 is a wasteful number, since it uses less digits than its factorization.

138991175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603 (or 5598 counting only the distinct ones).

The product of its digits is 68040, while the sum is 44.

The square root of 138991175 is about 11789.4518532458. The cubic root of 138991175 is about 517.9991838213. Note that the first 3 decimals are identical.

The spelling of 138991175 in words is "one hundred thirty-eight million, nine hundred ninety-one thousand, one hundred seventy-five".