505383887 has 4 divisors (see below), whose sum is σ = 505874160. Its totient is φ = 504893616.

The previous prime is 505383883. The next prime is 505383889. The reversal of 505383887 is 788383505.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 505383887 - 2² = 505383883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505383883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243587 + ... + 245652.

It is an arithmetic number, because the mean of its divisors is an integer number (126468540).

Almost surely, 2^505383887 is an apocalyptic number.

505383887 is a deficient number, since it is larger than the sum of its proper divisors (490273).

505383887 is a wasteful number, since it uses less digits than its factorization.

505383887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490272.

The product of its (nonzero) digits is 806400, while the sum is 47.

The square root of 505383887 is about 22480.7448052772. The cubic root of 505383887 is about 796.5391576146.

The spelling of 505383887 in words is "five hundred five million, three hundred eighty-three thousand, eight hundred eighty-seven".