6406385 has 8 divisors (see below), whose sum is σ = 7737576. Its totient is φ = 5091840.

The previous prime is 6406381. The next prime is 6406427. The reversal of 6406385 is 5836046.

It can be written as a sum of positive squares in 4 ways, for example, as 141376 + 6265009 = 376^2 + 2503^2 .

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

It is not a de Polignac number, because 6406385 - 2² = 6406381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3296 + ... + 4865.

It is an arithmetic number, because the mean of its divisors is an integer number (967197).

Almost surely, 2^6406385 is an apocalyptic number.

It is an amenable number.

6406385 is a deficient number, since it is larger than the sum of its proper divisors (1331191).

6406385 is a wasteful number, since it uses less digits than its factorization.

6406385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8323.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6406385 is about 2531.0837599732. The cubic root of 6406385 is about 185.7252756247.

The spelling of 6406385 in words is "six million, four hundred six thousand, three hundred eighty-five".