6406605 has 12 divisors (see below), whose sum is σ = 11104860. Its totient is φ = 3416832.

The previous prime is 6406601. The next prime is 6406639. The reversal of 6406605 is 5066046.

It can be written as a sum of positive squares in 2 ways, for example, as 3316041 + 3090564 = 1821^2 + 1758^2 .

It is not a de Polignac number, because 6406605 - 2² = 6406601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406601) 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 11 ways as a sum of consecutive naturals, for example, 71140 + ... + 71229.

It is an arithmetic number, because the mean of its divisors is an integer number (925405).

Almost surely, 2^6406605 is an apocalyptic number.

It is an amenable number.

6406605 is a deficient number, since it is larger than the sum of its proper divisors (4698255).

6406605 is a wasteful number, since it uses less digits than its factorization.

6406605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142380 (or 142377 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 6406605 is about 2531.1272192444. The cubic root of 6406605 is about 185.7274015814.

The spelling of 6406605 in words is "six million, four hundred six thousand, six hundred five".