4065989 has 2 divisors, whose sum is σ = 4065990. Its totient is φ = 4065988.

The previous prime is 4065983. The next prime is 4066021. The reversal of 4065989 is 9895604.

4065989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 1800964 = 1505^2 + 1342^2 .

It is a cyclic number.

It is not a de Polignac number, because 4065989 - 2⁴ = 4065973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4065983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2032994 + 2032995.

It is an arithmetic number, because the mean of its divisors is an integer number (2032995).

Almost surely, 2^4065989 is an apocalyptic number.

It is an amenable number.

4065989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4065989 is an equidigital number, since it uses as much as digits as its factorization.

4065989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 4065989 is about 2016.4297656998. The cubic root of 4065989 is about 159.6082734932.

The spelling of 4065989 in words is "four million, sixty-five thousand, nine hundred eighty-nine".