6406009 has 4 divisors (see below), whose sum is σ = 6438400. Its totient is φ = 6373620.

The previous prime is 6405989. The next prime is 6406051. The reversal of 6406009 is 9006046.

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 6406009 - 2¹³ = 6397817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6406079) 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, 15897 + ... + 16294.

It is an arithmetic number, because the mean of its divisors is an integer number (1609600).

Almost surely, 2^6406009 is an apocalyptic number.

It is an amenable number.

6406009 is a deficient number, since it is larger than the sum of its proper divisors (32391).

6406009 is a wasteful number, since it uses less digits than its factorization.

6406009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32390.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 6406009 is about 2531.0094824003. The cubic root of 6406009 is about 185.7216420586.

The spelling of 6406009 in words is "six million, four hundred six thousand, nine".