2005478 has 4 divisors (see below), whose sum is σ = 3008220. Its totient is φ = 1002738.

The previous prime is 2005459. The next prime is 2005489. The reversal of 2005478 is 8745002.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 501368 + ... + 501371.

It is an arithmetic number, because the mean of its divisors is an integer number (752055).

2^2005478 is an apocalyptic number.

2005478 is a deficient number, since it is larger than the sum of its proper divisors (1002742).

2005478 is a wasteful number, since it uses less digits than its factorization.

2005478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002741.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 2005478 is about 1416.1490034597. The cubic root of 2005478 is about 126.1070309177.

The spelling of 2005478 in words is "two million, five thousand, four hundred seventy-eight".