6440089 has 2 divisors, whose sum is σ = 6440090. Its totient is φ = 6440088.

The previous prime is 6440041. The next prime is 6440099. The reversal of 6440089 is 9800446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5569600 + 870489 = 2360^2 + 933^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440089 - 2⁹ = 6439577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6440089.

It is not a weakly prime, because it can be changed into another prime (6440029) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220044 + 3220045.

It is an arithmetic number, because the mean of its divisors is an integer number (3220045).

Almost surely, 2^6440089 is an apocalyptic number.

It is an amenable number.

6440089 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440089 is an equidigital number, since it uses as much as digits as its factorization.

6440089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 6440089 is about 2537.7330434859. The cubic root of 6440089 is about 186.0504064256.

The spelling of 6440089 in words is "six million, four hundred forty thousand, eighty-nine".