404545 has 4 divisors (see below), whose sum is σ = 485460. Its totient is φ = 323632.

The previous prime is 404539. The next prime is 404557. The reversal of 404545 is 545404.

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

It can be written as a sum of positive squares in 2 ways, for example, as 141376 + 263169 = 376^2 + 513^2 .

It is a cyclic number.

It is not a de Polignac number, because 404545 - 2⁵ = 404513 is a prime.

404545 is a modest number, since divided by 4545 gives 40 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40450 + ... + 40459.

It is an arithmetic number, because the mean of its divisors is an integer number (121365).

2⁴⁰⁴⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

404545 is a deficient number, since it is larger than the sum of its proper divisors (80915).

404545 is an equidigital number, since it uses as much as digits as its factorization.

404545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80914.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 404545 is about 636.0385208460. The cubic root of 404545 is about 73.9586450206.

Adding to 404545 its reverse (545404), we get a palindrome (949949).

It can be divided in two parts, 404 and 545, that added together give a palindrome (949).

The spelling of 404545 in words is "four hundred four thousand, five hundred forty-five".