139589 has 2 divisors, whose sum is σ = 139590. Its totient is φ = 139588.

The previous prime is 139571. The next prime is 139591. The reversal of 139589 is 985931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134689 + 4900 = 367^2 + 70^2 .

It is a cyclic number.

It is not a de Polignac number, because 139589 - 2⁸ = 139333 is a prime.

It is a Sophie Germain prime.

Together with 139591, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69794 + 69795.

It is an arithmetic number, because the mean of its divisors is an integer number (69795).

2¹³⁹⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

139589 is a deficient number, since it is larger than the sum of its proper divisors (1).

139589 is an equidigital number, since it uses as much as digits as its factorization.

139589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 139589 is about 373.6161131429. The cubic root of 139589 is about 51.8740789501.

The spelling of 139589 in words is "one hundred thirty-nine thousand, five hundred eighty-nine".