505205440 has 56 divisors (see below), whose sum is σ = 1266352560. Its totient is φ = 191443968.

The previous prime is 505205429. The next prime is 505205443. The reversal of 505205440 is 44502505.

It is not an unprimeable number, because it can be changed into a prime (505205443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35467 + ... + 47626.

Almost surely, 2^505205440 is an apocalyptic number.

It is an amenable number.

505205440 is an abundant number, since it is smaller than the sum of its proper divisors (761147120).

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

505205440 is a wasteful number, since it uses less digits than its factorization.

505205440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83129 (or 83119 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 505205440 is about 22476.7755694628. The cubic root of 505205440 is about 796.4453960474.

Adding to 505205440 its reverse (44502505), we get a palindrome (549707945).

The spelling of 505205440 in words is "five hundred five million, two hundred five thousand, four hundred forty".