138677389 has 2 divisors, whose sum is σ = 138677390. Its totient is φ = 138677388.

The previous prime is 138677387. The next prime is 138677411. The reversal of 138677389 is 983776831.

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., 119902500 + 18774889 = 10950^2 + 4333^2 .

It is a cyclic number.

It is not a de Polignac number, because 138677389 - 2¹ = 138677387 is a prime.

Together with 138677387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138677387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69338694 + 69338695.

It is an arithmetic number, because the mean of its divisors is an integer number (69338695).

Almost surely, 2^138677389 is an apocalyptic number.

It is an amenable number.

138677389 is a deficient number, since it is larger than the sum of its proper divisors (1).

138677389 is an equidigital number, since it uses as much as digits as its factorization.

138677389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 52.

The square root of 138677389 is about 11776.1364207451. The cubic root of 138677389 is about 517.6090790471.

The spelling of 138677389 in words is "one hundred thirty-eight million, six hundred seventy-seven thousand, three hundred eighty-nine".