2005404623 has 4 divisors (see below), whose sum is σ = 2005530960. Its totient is φ = 2005278288.

The previous prime is 2005404589. The next prime is 2005404629. The reversal of 2005404623 is 3264045002.

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

It is a cyclic number.

It is not a de Polignac number, because 2005404623 - 2¹⁸ = 2005142479 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2005404592 and 2005404601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005404629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35243 + ... + 72476.

It is an arithmetic number, because the mean of its divisors is an integer number (501382740).

Almost surely, 2^2005404623 is an apocalyptic number.

2005404623 is a deficient number, since it is larger than the sum of its proper divisors (126337).

2005404623 is a wasteful number, since it uses less digits than its factorization.

2005404623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126336.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 2005404623 is about 44781.7443050179. The cubic root of 2005404623 is about 1261.0549288567.

Adding to 2005404623 its reverse (3264045002), we get a palindrome (5269449625).

The spelling of 2005404623 in words is "two billion, five million, four hundred four thousand, six hundred twenty-three".