6403609 has 4 divisors (see below), whose sum is σ = 6539904. Its totient is φ = 6267316.

The previous prime is 6403601. The next prime is 6403643. The reversal of 6403609 is 9063046.

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 a cyclic number.

It is not a de Polignac number, because 6403609 - 2³ = 6403601 is a prime.

It is a Duffinian number.

6403609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6403601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68077 + ... + 68170.

It is an arithmetic number, because the mean of its divisors is an integer number (1634976).

Almost surely, 2^6403609 is an apocalyptic number.

It is an amenable number.

6403609 is a deficient number, since it is larger than the sum of its proper divisors (136295).

6403609 is a wasteful number, since it uses less digits than its factorization.

6403609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136294.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 6403609 is about 2530.5353188604. The cubic root of 6403609 is about 185.6984457327.

The spelling of 6403609 in words is "six million, four hundred three thousand, six hundred nine".