138756589 has 4 divisors (see below), whose sum is σ = 143232640. Its totient is φ = 134280540.

The previous prime is 138756577. The next prime is 138756593. The reversal of 138756589 is 985657831.

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.

It is a cyclic number.

It is not a de Polignac number, because 138756589 - 2⁵ = 138756557 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 (138756509) 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, 2237979 + ... + 2238040.

It is an arithmetic number, because the mean of its divisors is an integer number (35808160).

Almost surely, 2^138756589 is an apocalyptic number.

It is an amenable number.

138756589 is a deficient number, since it is larger than the sum of its proper divisors (4476051).

138756589 is an equidigital number, since it uses as much as digits as its factorization.

138756589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4476050.

The product of its digits is 1814400, while the sum is 52.

The square root of 138756589 is about 11779.4986735429. The cubic root of 138756589 is about 517.7075974806.

The spelling of 138756589 in words is "one hundred thirty-eight million, seven hundred fifty-six thousand, five hundred eighty-nine".