505144440 has 96 divisors (see below), whose sum is σ = 1647331920. Its totient is φ = 134244864.

The previous prime is 505144429. The next prime is 505144441. The reversal of 505144440 is 44441505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505144441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110439 + ... + 114921.

Almost surely, 2^505144440 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 505144440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823665960).

505144440 is an abundant number, since it is smaller than the sum of its proper divisors (1142187480).

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

505144440 is a wasteful number, since it uses less digits than its factorization.

505144440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4813 (or 4806 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 505144440 is about 22475.4185722980. The cubic root of 505144440 is about 796.4133396991.

Adding to 505144440 its reverse (44441505), we get a palindrome (549585945).

The spelling of 505144440 in words is "five hundred five million, one hundred forty-four thousand, four hundred forty".