3989009 has 2 divisors, whose sum is σ = 3989010. Its totient is φ = 3989008.

The previous prime is 3989003. The next prime is 3989021. The reversal of 3989009 is 9009893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3411409 + 577600 = 1847^2 + 760^2 .

It is an emirp because it is prime and its reverse (9009893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3989009 - 2⁸ = 3988753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3989003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994504 + 1994505.

It is an arithmetic number, because the mean of its divisors is an integer number (1994505).

Almost surely, 2^3989009 is an apocalyptic number.

It is an amenable number.

3989009 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989009 is an equidigital number, since it uses as much as digits as its factorization.

3989009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 3989009 is about 1997.2503598698. The cubic root of 3989009 is about 158.5945791175.

The spelling of 3989009 in words is "three million, nine hundred eighty-nine thousand, nine".