6400405 has 8 divisors (see below), whose sum is σ = 8378784. Its totient is φ = 4654800.

The previous prime is 6400403. The next prime is 6400411. The reversal of 6400405 is 5040046.

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

It is not a de Polignac number, because 6400405 - 2¹ = 6400403 is a prime.

It is a Duffinian number.

6400405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400403) 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 7 ways as a sum of consecutive naturals, for example, 58131 + ... + 58240.

It is an arithmetic number, because the mean of its divisors is an integer number (1047348).

Almost surely, 2^6400405 is an apocalyptic number.

It is an amenable number.

6400405 is a deficient number, since it is larger than the sum of its proper divisors (1978379).

6400405 is a wasteful number, since it uses less digits than its factorization.

6400405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116387.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 6400405 is about 2529.9021720217. The cubic root of 6400405 is about 185.6674696025.

The spelling of 6400405 in words is "six million, four hundred thousand, four hundred five".