505403440 has 40 divisors (see below), whose sum is σ = 1194990480. Its totient is φ = 198733056.

The previous prime is 505403413. The next prime is 505403441. The reversal of 505403440 is 44304505.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (505403441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48819 + ... + 58258.

It is an arithmetic number, because the mean of its divisors is an integer number (29874762).

Almost surely, 2^505403440 is an apocalyptic number.

It is an amenable number.

505403440 is an abundant number, since it is smaller than the sum of its proper divisors (689587040).

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

505403440 is a wasteful number, since it uses less digits than its factorization.

505403440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107149 (or 107143 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 505403440 is about 22481.1796843493. The cubic root of 505403440 is about 796.5494300231.

Adding to 505403440 its reverse (44304505), we get a palindrome (549707945).

The spelling of 505403440 in words is "five hundred five million, four hundred three thousand, four hundred forty".