127999139 has 2 divisors, whose sum is σ = 127999140. Its totient is φ = 127999138.

The previous prime is 127999099. The next prime is 127999147. The reversal of 127999139 is 931999721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 127999139 - 2⁸ = 127998883 is a prime.

It is not a weakly prime, because it can be changed into another prime (127999199) 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, 63999569 + 63999570.

It is an arithmetic number, because the mean of its divisors is an integer number (63999570).

Almost surely, 2^127999139 is an apocalyptic number.

127999139 is a deficient number, since it is larger than the sum of its proper divisors (1).

127999139 is an equidigital number, since it uses as much as digits as its factorization.

127999139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 50.

The square root of 127999139 is about 11313.6704477371. The cubic root of 127999139 is about 503.9672899637.

The spelling of 127999139 in words is "one hundred twenty-seven million, nine hundred ninety-nine thousand, one hundred thirty-nine".