138940937 has 2 divisors, whose sum is σ = 138940938. Its totient is φ = 138940936.

The previous prime is 138940927. The next prime is 138940969. The reversal of 138940937 is 739049831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91317136 + 47623801 = 9556^2 + 6901^2 .

It is a cyclic number.

It is not a de Polignac number, because 138940937 - 2⁶ = 138940873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138940927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69470468 + 69470469.

It is an arithmetic number, because the mean of its divisors is an integer number (69470469).

Almost surely, 2^138940937 is an apocalyptic number.

It is an amenable number.

138940937 is a deficient number, since it is larger than the sum of its proper divisors (1).

138940937 is an equidigital number, since it uses as much as digits as its factorization.

138940937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 138940937 is about 11787.3210272733. The cubic root of 138940937 is about 517.9367664796.

The spelling of 138940937 in words is "one hundred thirty-eight million, nine hundred forty thousand, nine hundred thirty-seven".