505440424 has 32 divisors (see below), whose sum is σ = 975349800. Its totient is φ = 245376000.

The previous prime is 505440421. The next prime is 505440443. The reversal of 505440424 is 424044505.

It can be written as a sum of positive squares in 4 ways, for example, as 452412900 + 53027524 = 21270^2 + 7282^2 .

It is a junction number, because it is equal to n+sod(n) for n = 505440392 and 505440401.

It is not an unprimeable number, because it can be changed into a prime (505440421) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 166924 + ... + 169924.

Almost surely, 2^505440424 is an apocalyptic number.

It is an amenable number.

505440424 is a deficient number, since it is larger than the sum of its proper divisors (469909376).

505440424 is a wasteful number, since it uses less digits than its factorization.

505440424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613 (or 3609 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 28.

The square root of 505440424 is about 22482.0022240013. The cubic root of 505440424 is about 796.5688592970.

Adding to 505440424 its reverse (424044505), we get a palindrome (929484929).

The spelling of 505440424 in words is "five hundred five million, four hundred forty thousand, four hundred twenty-four".