138259623 has 12 divisors (see below), whose sum is σ = 195829160. Its totient is φ = 86750592.

The previous prime is 138259621. The next prime is 138259661. The reversal of 138259623 is 326952831.

It is not a de Polignac number, because 138259623 - 2¹ = 138259621 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 (138259621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78868 + ... + 80601.

Almost surely, 2^138259623 is an apocalyptic number.

138259623 is a deficient number, since it is larger than the sum of its proper divisors (57569537).

138259623 is a wasteful number, since it uses less digits than its factorization.

138259623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159506 (or 159489 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 138259623 is about 11758.3852207690. The cubic root of 138259623 is about 517.0887900010.

The spelling of 138259623 in words is "one hundred thirty-eight million, two hundred fifty-nine thousand, six hundred twenty-three".