505429218 has 54 divisors (see below), whose sum is σ = 1275572961. Its totient is φ = 144217584.

The previous prime is 505429217. The next prime is 505429229. The reversal of 505429218 is 812924505.

It can be written as a sum of positive squares in 2 ways, for example, as 498316329 + 7112889 = 22323^2 + 2667^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=15897.

It is not an unprimeable number, because it can be changed into a prime (505429217) 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 26 ways as a sum of consecutive naturals, for example, 667296 + ... + 668052.

Almost surely, 2^505429218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505429218

505429218 is an abundant number, since it is smaller than the sum of its proper divisors (770143743).

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

505429218 is an equidigital number, since it uses as much as digits as its factorization.

505429218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536 (or 769 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 505429218 is about 22481.7530010451. The cubic root of 505429218 is about 796.5629724069.

Multiplying 505429218 by its product of nonzero digits (28800), we get a square (14556361478400 = 3815280²).

The spelling of 505429218 in words is "five hundred five million, four hundred twenty-nine thousand, two hundred eighteen".