505440420 has 96 divisors (see below), whose sum is σ = 1482969600. Its totient is φ = 128454144.

The previous prime is 505440401. The next prime is 505440421. The reversal of 505440420 is 24044505.

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 31 ways as a sum of consecutive naturals, for example, 135622 + ... + 139298.

It is an arithmetic number, because the mean of its divisors is an integer number (15447600).

Almost surely, 2^505440420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505440420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741484800).

505440420 is an abundant number, since it is smaller than the sum of its proper divisors (977529180).

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

505440420 is a wasteful number, since it uses less digits than its factorization.

505440420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797 (or 3795 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 505440420 is about 22482.0021350413. The cubic root of 505440420 is about 796.5688571957.

Adding to 505440420 its reverse (24044505), we get a palindrome (529484925).

The spelling of 505440420 in words is "five hundred five million, four hundred forty thousand, four hundred twenty".