138673277 has 2 divisors, whose sum is σ = 138673278. Its totient is φ = 138673276.

The previous prime is 138673259. The next prime is 138673307. The reversal of 138673277 is 772376831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79905721 + 58767556 = 8939^2 + 7666^2 .

It is an emirp because it is prime and its reverse (772376831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138673277 - 2⁸ = 138673021 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 (138673207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69336638 + 69336639.

It is an arithmetic number, because the mean of its divisors is an integer number (69336639).

Almost surely, 2^138673277 is an apocalyptic number.

It is an amenable number.

138673277 is a deficient number, since it is larger than the sum of its proper divisors (1).

138673277 is an equidigital number, since it uses as much as digits as its factorization.

138673277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 44.

The square root of 138673277 is about 11775.9618290822. The cubic root of 138673277 is about 517.6039630255.

The spelling of 138673277 in words is "one hundred thirty-eight million, six hundred seventy-three thousand, two hundred seventy-seven".