138676949 has 2 divisors, whose sum is σ = 138676950. Its totient is φ = 138676948.

The previous prime is 138676921. The next prime is 138677083. The reversal of 138676949 is 949676831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107952100 + 30724849 = 10390^2 + 5543^2 .

It is a cyclic number.

It is not a de Polignac number, because 138676949 - 2⁸ = 138676693 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138676949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138673949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69338474 + 69338475.

It is an arithmetic number, because the mean of its divisors is an integer number (69338475).

Almost surely, 2^138676949 is an apocalyptic number.

It is an amenable number.

138676949 is a deficient number, since it is larger than the sum of its proper divisors (1).

138676949 is an equidigital number, since it uses as much as digits as its factorization.

138676949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 138676949 is about 11776.1177388815. The cubic root of 138676949 is about 517.6085316177.

The spelling of 138676949 in words is "one hundred thirty-eight million, six hundred seventy-six thousand, nine hundred forty-nine".