4128689 has 2 divisors, whose sum is σ = 4128690. Its totient is φ = 4128688.

The previous prime is 4128623. The next prime is 4128697. The reversal of 4128689 is 9868214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 1982464 = 1465^2 + 1408^2 .

It is a cyclic number.

It is not a de Polignac number, because 4128689 - 2²⁰ = 3080113 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (4128589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2064344 + 2064345.

It is an arithmetic number, because the mean of its divisors is an integer number (2064345).

Almost surely, 2^4128689 is an apocalyptic number.

It is an amenable number.

4128689 is a deficient number, since it is larger than the sum of its proper divisors (1).

4128689 is an equidigital number, since it uses as much as digits as its factorization.

4128689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 4128689 is about 2031.9175672256. The cubic root of 4128689 is about 160.4245107163.

The spelling of 4128689 in words is "four million, one hundred twenty-eight thousand, six hundred eighty-nine".