6499809 has 12 divisors (see below), whose sum is σ = 9417252. Its totient is φ = 4320000.

The previous prime is 6499793. The next prime is 6499841. The reversal of 6499809 is 9089946.

6499809 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4112784 + 2387025 = 2028^2 + 1545^2 .

It is not a de Polignac number, because 6499809 - 2⁴ = 6499793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6499859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2709 + ... + 4509.

It is an arithmetic number, because the mean of its divisors is an integer number (784771).

Almost surely, 2^6499809 is an apocalyptic number.

It is an amenable number.

6499809 is a deficient number, since it is larger than the sum of its proper divisors (2917443).

6499809 is a wasteful number, since it uses less digits than its factorization.

6499809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208 (or 2205 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 6499809 is about 2549.4722983394. The cubic root of 6499809 is about 186.6237298495.

The spelling of 6499809 in words is "six million, four hundred ninety-nine thousand, eight hundred nine".