505423430 has 72 divisors (see below), whose sum is σ = 1003433184. Its totient is φ = 183175680.

The previous prime is 505423417. The next prime is 505423433. The reversal of 505423430 is 34324505.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 505423430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505423433) 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 35 ways as a sum of consecutive naturals, for example, 8285600 + ... + 8285660.

It is an arithmetic number, because the mean of its divisors is an integer number (13936572).

Almost surely, 2^505423430 is an apocalyptic number.

505423430 is a deficient number, since it is larger than the sum of its proper divisors (498009754).

505423430 is a wasteful number, since it uses less digits than its factorization.

505423430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 505423430 is about 22481.6242740599. The cubic root of 505423430 is about 796.5599317411.

Adding to 505423430 its reverse (34324505), we get a palindrome (539747935).

The spelling of 505423430 in words is "five hundred five million, four hundred twenty-three thousand, four hundred thirty".