2005638 has 32 divisors (see below), whose sum is σ = 4257792. Its totient is φ = 628800.

The previous prime is 2005613. The next prime is 2005667. The reversal of 2005638 is 8365002.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7495 + ... + 7757.

It is an arithmetic number, because the mean of its divisors is an integer number (133056).

2^2005638 is an apocalyptic number.

2005638 is an abundant number, since it is smaller than the sum of its proper divisors (2252154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2005638 is a wasteful number, since it uses less digits than its factorization.

2005638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2005638 is about 1416.2054935637. The cubic root of 2005638 is about 126.1103844970.

The spelling of 2005638 in words is "two million, five thousand, six hundred thirty-eight".