138363409 has 2 divisors, whose sum is σ = 138363410. Its totient is φ = 138363408.

The previous prime is 138363371. The next prime is 138363431. The reversal of 138363409 is 904363831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138133009 + 230400 = 11753^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 138363409 - 2⁹ = 138362897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138367409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69181704 + 69181705.

It is an arithmetic number, because the mean of its divisors is an integer number (69181705).

Almost surely, 2^138363409 is an apocalyptic number.

It is an amenable number.

138363409 is a deficient number, since it is larger than the sum of its proper divisors (1).

138363409 is an equidigital number, since it uses as much as digits as its factorization.

138363409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 138363409 is about 11762.7976689221. The cubic root of 138363409 is about 517.2181436357.

The spelling of 138363409 in words is "one hundred thirty-eight million, three hundred sixty-three thousand, four hundred nine".