138437975 has 24 divisors (see below), whose sum is σ = 187925472. Its totient is φ = 100540800.

The previous prime is 138437963. The next prime is 138437977. The reversal of 138437975 is 579734831.

It is not a de Polignac number, because 138437975 - 2¹⁸ = 138175831 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138437977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16334 + ... + 23316.

It is an arithmetic number, because the mean of its divisors is an integer number (7830228).

Almost surely, 2^138437975 is an apocalyptic number.

138437975 is a deficient number, since it is larger than the sum of its proper divisors (49487497).

138437975 is a wasteful number, since it uses less digits than its factorization.

138437975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7067 (or 7062 counting only the distinct ones).

The product of its digits is 635040, while the sum is 47.

The square root of 138437975 is about 11765.9668111040. The cubic root of 138437975 is about 517.3110390102.

The spelling of 138437975 in words is "one hundred thirty-eight million, four hundred thirty-seven thousand, nine hundred seventy-five".