138908827 has 2 divisors, whose sum is σ = 138908828. Its totient is φ = 138908826.

The previous prime is 138908807. The next prime is 138908843. The reversal of 138908827 is 728809831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138908827 is a prime.

It is not a weakly prime, because it can be changed into another prime (138908807) 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, 69454413 + 69454414.

It is an arithmetic number, because the mean of its divisors is an integer number (69454414).

Almost surely, 2^138908827 is an apocalyptic number.

138908827 is a deficient number, since it is larger than the sum of its proper divisors (1).

138908827 is an equidigital number, since it uses as much as digits as its factorization.

138908827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 138908827 is about 11785.9588918340. The cubic root of 138908827 is about 517.8968640787.

The spelling of 138908827 in words is "one hundred thirty-eight million, nine hundred eight thousand, eight hundred twenty-seven".