2005406 has 16 divisors (see below), whose sum is σ = 3268944. Its totient is φ = 917184.

The previous prime is 2005397. The next prime is 2005417. The reversal of 2005406 is 6045002.

It is a congruent number.

It is an unprimeable number.

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, 3281 + ... + 3843.

It is an arithmetic number, because the mean of its divisors is an integer number (204309).

2^2005406 is an apocalyptic number.

2005406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2005406 is a deficient number, since it is larger than the sum of its proper divisors (1263538).

2005406 is a wasteful number, since it uses less digits than its factorization.

2005406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 2005406 is about 1416.1235821778. The cubic root of 2005406 is about 126.1055217489.

The spelling of 2005406 in words is "two million, five thousand, four hundred six".