138858589 has 2 divisors, whose sum is σ = 138858590. Its totient is φ = 138858588.

The previous prime is 138858563. The next prime is 138858617. The reversal of 138858589 is 985858831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137124100 + 1734489 = 11710^2 + 1317^2 .

It is a cyclic number.

It is not a de Polignac number, because 138858589 - 2⁵ = 138858557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138858529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69429294 + 69429295.

It is an arithmetic number, because the mean of its divisors is an integer number (69429295).

Almost surely, 2^138858589 is an apocalyptic number.

It is an amenable number.

138858589 is a deficient number, since it is larger than the sum of its proper divisors (1).

138858589 is an equidigital number, since it uses as much as digits as its factorization.

138858589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2764800, while the sum is 55.

The square root of 138858589 is about 11783.8274342422. The cubic root of 138858589 is about 517.8344220668.

The spelling of 138858589 in words is "one hundred thirty-eight million, eight hundred fifty-eight thousand, five hundred eighty-nine".