6409899 has 24 divisors (see below), whose sum is σ = 9828000. Its totient is φ = 4018560.

The previous prime is 6409889. The next prime is 6409913. The reversal of 6409899 is 9989046.

It is not a de Polignac number, because 6409899 - 2⁴ = 6409883 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6409849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10402 + ... + 11000.

It is an arithmetic number, because the mean of its divisors is an integer number (409500).

Almost surely, 2^6409899 is an apocalyptic number.

6409899 is a deficient number, since it is larger than the sum of its proper divisors (3418101).

6409899 is a wasteful number, since it uses less digits than its factorization.

6409899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 672 counting only the distinct ones).

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

The square root of 6409899 is about 2531.7778338551. Note that the first 3 decimals coincide. The cubic root of 6409899 is about 185.7592271344.

The spelling of 6409899 in words is "six million, four hundred nine thousand, eight hundred ninety-nine".