505168387 has 4 divisors (see below), whose sum is σ = 514699920. Its totient is φ = 495636856.

The previous prime is 505168331. The next prime is 505168397. The reversal of 505168387 is 783861505.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505168387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505168327) 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 3 ways as a sum of consecutive naturals, for example, 4765687 + ... + 4765792.

It is an arithmetic number, because the mean of its divisors is an integer number (128674980).

Almost surely, 2^505168387 is an apocalyptic number.

505168387 is a deficient number, since it is larger than the sum of its proper divisors (9531533).

505168387 is an equidigital number, since it uses as much as digits as its factorization.

505168387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9531532.

The product of its (nonzero) digits is 201600, while the sum is 43.

The square root of 505168387 is about 22475.9513035600. The cubic root of 505168387 is about 796.4259244883.

The spelling of 505168387 in words is "five hundred five million, one hundred sixty-eight thousand, three hundred eighty-seven".