138544375 has 10 divisors (see below), whose sum is σ = 173125832. Its totient is φ = 110835000.

The previous prime is 138544361. The next prime is 138544379. The reversal of 138544375 is 573445831.

It is not a de Polignac number, because 138544375 - 2⁷ = 138544247 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 (138544379) 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 9 ways as a sum of consecutive naturals, for example, 110211 + ... + 111460.

Almost surely, 2^138544375 is an apocalyptic number.

138544375 is a deficient number, since it is larger than the sum of its proper divisors (34581457).

138544375 is an frugal number, since it uses more digits than its factorization.

138544375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221691 (or 221676 counting only the distinct ones).

The product of its digits is 201600, while the sum is 40.

The square root of 138544375 is about 11770.4874580452. The cubic root of 138544375 is about 517.4435358902.

The spelling of 138544375 in words is "one hundred thirty-eight million, five hundred forty-four thousand, three hundred seventy-five".