138995999 has 2 divisors, whose sum is σ = 138996000. Its totient is φ = 138995998.

The previous prime is 138995933. The next prime is 138996041. The reversal of 138995999 is 999599831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138995999 - 2⁸ = 138995743 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138995929) 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, 69497999 + 69498000.

It is an arithmetic number, because the mean of its divisors is an integer number (69498000).

Almost surely, 2^138995999 is an apocalyptic number.

138995999 is a deficient number, since it is larger than the sum of its proper divisors (1).

138995999 is an equidigital number, since it uses as much as digits as its factorization.

138995999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7085880, while the sum is 62.

The square root of 138995999 is about 11789.6564411352. The cubic root of 138995999 is about 518.0051765258.

The spelling of 138995999 in words is "one hundred thirty-eight million, nine hundred ninety-five thousand, nine hundred ninety-nine".