138520589 has 4 divisors (see below), whose sum is σ = 139517280. Its totient is φ = 137523900.

The previous prime is 138520561. The next prime is 138520601. The reversal of 138520589 is 985025831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 985025831 = 101 ⋅9752731.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138520589 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 (138523589) 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, 498137 + ... + 498414.

It is an arithmetic number, because the mean of its divisors is an integer number (34879320).

Almost surely, 2^138520589 is an apocalyptic number.

It is an amenable number.

138520589 is a deficient number, since it is larger than the sum of its proper divisors (996691).

138520589 is an equidigital number, since it uses as much as digits as its factorization.

138520589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996690.

The product of its (nonzero) digits is 86400, while the sum is 41.

The square root of 138520589 is about 11769.4770062225. The cubic root of 138520589 is about 517.4139217531.

The spelling of 138520589 in words is "one hundred thirty-eight million, five hundred twenty thousand, five hundred eighty-nine".