138726349 has 2 divisors, whose sum is σ = 138726350. Its totient is φ = 138726348.

The previous prime is 138726319. The next prime is 138726359. The reversal of 138726349 is 943627831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130942249 + 7784100 = 11443^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 138726349 - 2⁷ = 138726221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138726319) 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, 69363174 + 69363175.

It is an arithmetic number, because the mean of its divisors is an integer number (69363175).

Almost surely, 2^138726349 is an apocalyptic number.

It is an amenable number.

138726349 is a deficient number, since it is larger than the sum of its proper divisors (1).

138726349 is an equidigital number, since it uses as much as digits as its factorization.

138726349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 138726349 is about 11778.2150175653. The cubic root of 138726349 is about 517.6699857768.

The spelling of 138726349 in words is "one hundred thirty-eight million, seven hundred twenty-six thousand, three hundred forty-nine".