127399889 has 2 divisors, whose sum is σ = 127399890. Its totient is φ = 127399888.

The previous prime is 127399873. The next prime is 127399907. The reversal of 127399889 is 988993721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113209600 + 14190289 = 10640^2 + 3767^2 .

It is a cyclic number.

It is not a de Polignac number, because 127399889 - 2⁴ = 127399873 is a prime.

It is not a weakly prime, because it can be changed into another prime (127399289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63699944 + 63699945.

It is an arithmetic number, because the mean of its divisors is an integer number (63699945).

Almost surely, 2^127399889 is an apocalyptic number.

It is an amenable number.

127399889 is a deficient number, since it is larger than the sum of its proper divisors (1).

127399889 is an equidigital number, since it uses as much as digits as its factorization.

127399889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 56.

The square root of 127399889 is about 11287.1559305256. The cubic root of 127399889 is about 503.1795895605.

The spelling of 127399889 in words is "one hundred twenty-seven million, three hundred ninety-nine thousand, eight hundred eighty-nine".