505399885 has 16 divisors (see below), whose sum is σ = 648400896. Its totient is φ = 376835328.

The previous prime is 505399879. The next prime is 505399897. The reversal of 505399885 is 588993505.

It is not a de Polignac number, because 505399885 - 2¹³ = 505391693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20109 + ... + 37618.

It is an arithmetic number, because the mean of its divisors is an integer number (40525056).

Almost surely, 2^505399885 is an apocalyptic number.

It is an amenable number.

505399885 is a deficient number, since it is larger than the sum of its proper divisors (143001011).

505399885 is a wasteful number, since it uses less digits than its factorization.

505399885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57852.

The product of its (nonzero) digits is 1944000, while the sum is 52.

The square root of 505399885 is about 22481.1006180747. The cubic root of 505399885 is about 796.5475623799.

It can be divided in two parts, 50 and 5399885, that added together give a palindrome (5399935).

The spelling of 505399885 in words is "five hundred five million, three hundred ninety-nine thousand, eight hundred eighty-five".