138385589 has 4 divisors (see below), whose sum is σ = 140281356. Its totient is φ = 136489824.

The previous prime is 138385573. The next prime is 138385591. The reversal of 138385589 is 985583831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 985583831 = 3881 ⋅253951.

It can be written as a sum of positive squares in 2 ways, for example, as 103693489 + 34692100 = 10183^2 + 5890^2 .

It is a cyclic number.

It is not a de Polignac number, because 138385589 - 2⁴ = 138385573 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 (138385889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947774 + ... + 947919.

It is an arithmetic number, because the mean of its divisors is an integer number (35070339).

Almost surely, 2^138385589 is an apocalyptic number.

It is an amenable number.

138385589 is a deficient number, since it is larger than the sum of its proper divisors (1895767).

138385589 is an equidigital number, since it uses as much as digits as its factorization.

138385589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895766.

The product of its digits is 1036800, while the sum is 50.

The square root of 138385589 is about 11763.7404340626. The cubic root of 138385589 is about 517.2457792791.

The spelling of 138385589 in words is "one hundred thirty-eight million, three hundred eighty-five thousand, five hundred eighty-nine".