2005646 has 16 divisors (see below), whose sum is σ = 3196800. Its totient is φ = 941688.

The previous prime is 2005613. The next prime is 2005667. The reversal of 2005646 is 6465002.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2345 + ... + 3083.

It is an arithmetic number, because the mean of its divisors is an integer number (199800).

2^2005646 is an apocalyptic number.

2005646 is a deficient number, since it is larger than the sum of its proper divisors (1191154).

2005646 is a wasteful number, since it uses less digits than its factorization.

2005646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2005646 is about 1416.2083180097. The cubic root of 2005646 is about 126.1105521713.

It can be divided in two parts, 20056 and 46, that added together give a palindrome (20102).

The spelling of 2005646 in words is "two million, five thousand, six hundred forty-six".