127935989 has 2 divisors, whose sum is σ = 127935990. Its totient is φ = 127935988.

The previous prime is 127935967. The next prime is 127936007. The reversal of 127935989 is 989539721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96687889 + 31248100 = 9833^2 + 5590^2 .

It is a cyclic number.

It is not a de Polignac number, because 127935989 - 2¹⁶ = 127870453 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127935989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127935089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63967994 + 63967995.

It is an arithmetic number, because the mean of its divisors is an integer number (63967995).

Almost surely, 2^127935989 is an apocalyptic number.

It is an amenable number.

127935989 is a deficient number, since it is larger than the sum of its proper divisors (1).

127935989 is an equidigital number, since it uses as much as digits as its factorization.

127935989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 53.

The square root of 127935989 is about 11310.8792319607. The cubic root of 127935989 is about 503.8843967769.

The spelling of 127935989 in words is "one hundred twenty-seven million, nine hundred thirty-five thousand, nine hundred eighty-nine".