138943589 has 2 divisors, whose sum is σ = 138943590. Its totient is φ = 138943588.

The previous prime is 138943583. The next prime is 138943603. The reversal of 138943589 is 985349831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107952100 + 30991489 = 10390^2 + 5567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138943589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138943583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69471794 + 69471795.

It is an arithmetic number, because the mean of its divisors is an integer number (69471795).

Almost surely, 2^138943589 is an apocalyptic number.

It is an amenable number.

138943589 is a deficient number, since it is larger than the sum of its proper divisors (1).

138943589 is an equidigital number, since it uses as much as digits as its factorization.

138943589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 50.

The square root of 138943589 is about 11787.4335204912. The cubic root of 138943589 is about 517.9400617877.

The spelling of 138943589 in words is "one hundred thirty-eight million, nine hundred forty-three thousand, five hundred eighty-nine".