505788399 has 12 divisors (see below), whose sum is σ = 732892056. Its totient is φ = 336126672.

The previous prime is 505788389. The next prime is 505788421. The reversal of 505788399 is 993887505.

It is not a de Polignac number, because 505788399 - 2¹⁵ = 505755631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505788329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85789 + ... + 91494.

It is an arithmetic number, because the mean of its divisors is an integer number (61074338).

Almost surely, 2^505788399 is an apocalyptic number.

505788399 is a deficient number, since it is larger than the sum of its proper divisors (227103657).

505788399 is a wasteful number, since it uses less digits than its factorization.

505788399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177606 (or 177603 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The square root of 505788399 is about 22489.7398606565. The cubic root of 505788399 is about 796.7516190247.

The spelling of 505788399 in words is "five hundred five million, seven hundred eighty-eight thousand, three hundred ninety-nine".