6490409 has 2 divisors, whose sum is σ = 6490410. Its totient is φ = 6490408.

The previous prime is 6490391. The next prime is 6490411. The reversal of 6490409 is 9040946.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6451600 + 38809 = 2540^2 + 197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6490409 is a prime.

Together with 6490411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6490109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3245204 + 3245205.

It is an arithmetic number, because the mean of its divisors is an integer number (3245205).

Almost surely, 2^6490409 is an apocalyptic number.

It is an amenable number.

6490409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6490409 is an equidigital number, since it uses as much as digits as its factorization.

6490409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 6490409 is about 2547.6281125784. The cubic root of 6490409 is about 186.5337215939.

The spelling of 6490409 in words is "six million, four hundred ninety thousand, four hundred nine".