138307489 has 2 divisors, whose sum is σ = 138307490. Its totient is φ = 138307488.

The previous prime is 138307483. The next prime is 138307531. The reversal of 138307489 is 984703831.

It is a happy number.

138307489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129504400 + 8803089 = 11380^2 + 2967^2 .

It is an emirp because it is prime and its reverse (984703831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138307489 - 2⁹ = 138306977 is a prime.

It is not a weakly prime, because it can be changed into another prime (138307483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69153744 + 69153745.

It is an arithmetic number, because the mean of its divisors is an integer number (69153745).

Almost surely, 2^138307489 is an apocalyptic number.

It is an amenable number.

138307489 is a deficient number, since it is larger than the sum of its proper divisors (1).

138307489 is an equidigital number, since it uses as much as digits as its factorization.

138307489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 138307489 is about 11760.4204431644. The cubic root of 138307489 is about 517.1484558088.

The spelling of 138307489 in words is "one hundred thirty-eight million, three hundred seven thousand, four hundred eighty-nine".