6409405 has 8 divisors (see below), whose sum is σ = 7939584. Its totient is φ = 4962000.

The previous prime is 6409397. The next prime is 6409409. The reversal of 6409405 is 5049046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6409405 - 2³ = 6409397 is a prime.

It is a Duffinian number.

6409405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6409409) 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 7 ways as a sum of consecutive naturals, for example, 20521 + ... + 20830.

It is an arithmetic number, because the mean of its divisors is an integer number (992448).

Almost surely, 2^6409405 is an apocalyptic number.

It is an amenable number.

6409405 is a deficient number, since it is larger than the sum of its proper divisors (1530179).

6409405 is a wasteful number, since it uses less digits than its factorization.

6409405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41387.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6409405 is about 2531.6802720723. The cubic root of 6409405 is about 185.7544549627.

The spelling of 6409405 in words is "six million, four hundred nine thousand, four hundred five".