138940927 has 2 divisors, whose sum is σ = 138940928. Its totient is φ = 138940926.

The previous prime is 138940913. The next prime is 138940937. The reversal of 138940927 is 729049831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138940927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138940937) 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, 69470463 + 69470464.

It is an arithmetic number, because the mean of its divisors is an integer number (69470464).

Almost surely, 2^138940927 is an apocalyptic number.

138940927 is a deficient number, since it is larger than the sum of its proper divisors (1).

138940927 is an equidigital number, since it uses as much as digits as its factorization.

138940927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 138940927 is about 11787.3206030887. The cubic root of 138940927 is about 517.9367540538.

The spelling of 138940927 in words is "one hundred thirty-eight million, nine hundred forty thousand, nine hundred twenty-seven".