6403138609 has 4 divisors (see below), whose sum is σ = 7317872704. Its totient is φ = 5488404516.

The previous prime is 6403138601. The next prime is 6403138631. The reversal of 6403138609 is 9068313046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6403138609 - 2³ = 6403138601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6403138601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457367037 + ... + 457367050.

It is an arithmetic number, because the mean of its divisors is an integer number (1829468176).

Almost surely, 2^6403138609 is an apocalyptic number.

It is an amenable number.

6403138609 is a deficient number, since it is larger than the sum of its proper divisors (914734095).

6403138609 is an equidigital number, since it uses as much as digits as its factorization.

6403138609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914734094.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 6403138609 is about 80019.6139018428. The cubic root of 6403138609 is about 1856.9389866054.

The spelling of 6403138609 in words is "six billion, four hundred three million, one hundred thirty-eight thousand, six hundred nine".