6408699309 has 18 divisors (see below), whose sum is σ = 9297137070. Its totient is φ = 4253967216.

The previous prime is 6408699301. The next prime is 6408699313. The reversal of 6408699309 is 9039968046.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4026283209 + 2382416100 = 63453^2 + 48810^2 .

It is not a de Polignac number, because 6408699309 - 2³ = 6408699301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6408699301) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3938154 + ... + 3939780.

It is an arithmetic number, because the mean of its divisors is an integer number (516507615).

Almost surely, 2^6408699309 is an apocalyptic number.

It is an amenable number.

6408699309 is a deficient number, since it is larger than the sum of its proper divisors (2888437761).

6408699309 is an equidigital number, since it uses as much as digits as its factorization.

6408699309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529 (or 1899 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 6408699309 is about 80054.3522177277. The cubic root of 6408699309 is about 1857.4763737412.

The spelling of 6408699309 in words is "six billion, four hundred eight million, six hundred ninety-nine thousand, three hundred nine".