138539677 has 2 divisors, whose sum is σ = 138539678. Its totient is φ = 138539676.

The previous prime is 138539671. The next prime is 138539683. The reversal of 138539677 is 776935831.

It is a balanced prime because it is at equal distance from previous prime (138539671) and next prime (138539683).

It can be written as a sum of positive squares in only one way, i.e., 138156516 + 383161 = 11754^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 138539677 - 2¹¹ = 138537629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138539677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138539671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69269838 + 69269839.

It is an arithmetic number, because the mean of its divisors is an integer number (69269839).

Almost surely, 2^138539677 is an apocalyptic number.

It is an amenable number.

138539677 is a deficient number, since it is larger than the sum of its proper divisors (1).

138539677 is an equidigital number, since it uses as much as digits as its factorization.

138539677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 49.

The square root of 138539677 is about 11770.2878894273. The cubic root of 138539677 is about 517.4376870368.

The spelling of 138539677 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, six hundred seventy-seven".