505478393 has 4 divisors (see below), whose sum is σ = 577689600. Its totient is φ = 433267188.

The previous prime is 505478377. The next prime is 505478399. The reversal of 505478393 is 393874505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505478393 - 2⁴ = 505478377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (505478399) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36105593 + ... + 36105606.

It is an arithmetic number, because the mean of its divisors is an integer number (144422400).

Almost surely, 2^505478393 is an apocalyptic number.

It is an amenable number.

505478393 is a deficient number, since it is larger than the sum of its proper divisors (72211207).

505478393 is an equidigital number, since it uses as much as digits as its factorization.

505478393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72211206.

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 505478393 is about 22482.8466391603. The cubic root of 505478393 is about 796.5888050475.

The spelling of 505478393 in words is "five hundred five million, four hundred seventy-eight thousand, three hundred ninety-three".