127699889 has 2 divisors, whose sum is σ = 127699890. Its totient is φ = 127699888.

The previous prime is 127699877. The next prime is 127699951. The reversal of 127699889 is 988996721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77176225 + 50523664 = 8785^2 + 7108^2 .

It is a cyclic number.

It is not a de Polignac number, because 127699889 - 2²⁰ = 126651313 is a prime.

It is a super-2 number, since 2×127699889² = 32614523301224642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (127699829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63849944 + 63849945.

It is an arithmetic number, because the mean of its divisors is an integer number (63849945).

Almost surely, 2^127699889 is an apocalyptic number.

It is an amenable number.

127699889 is a deficient number, since it is larger than the sum of its proper divisors (1).

127699889 is an equidigital number, since it uses as much as digits as its factorization.

127699889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 59.

The square root of 127699889 is about 11300.4375579001. The cubic root of 127699889 is about 503.5742407243.

The spelling of 127699889 in words is "one hundred twenty-seven million, six hundred ninety-nine thousand, eight hundred eighty-nine".