138766907 has 2 divisors, whose sum is σ = 138766908. Its totient is φ = 138766906.

The previous prime is 138766871. The next prime is 138766913. The reversal of 138766907 is 709667831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138766907 - 2⁸ = 138766651 is a prime.

It is not a weakly prime, because it can be changed into another prime (138766207) 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, 69383453 + 69383454.

It is an arithmetic number, because the mean of its divisors is an integer number (69383454).

Almost surely, 2^138766907 is an apocalyptic number.

138766907 is a deficient number, since it is larger than the sum of its proper divisors (1).

138766907 is an equidigital number, since it uses as much as digits as its factorization.

138766907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 138766907 is about 11779.9366297107. The cubic root of 138766907 is about 517.7204294829.

The spelling of 138766907 in words is "one hundred thirty-eight million, seven hundred sixty-six thousand, nine hundred seven".