505878939 has 20 divisors (see below), whose sum is σ = 761228424. Its totient is φ = 334783584.

The previous prime is 505878889. The next prime is 505878953. The reversal of 505878939 is 939878505.

505878939 is a `hidden beast` number, since 50 + 587 + 8 + 9 + 3 + 9 = 666.

It is not a de Polignac number, because 505878939 - 2¹³ = 505870747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505878239) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11697 + ... + 33890.

Almost surely, 2^505878939 is an apocalyptic number.

505878939 is a deficient number, since it is larger than the sum of its proper divisors (255349485).

505878939 is a wasteful number, since it uses less digits than its factorization.

505878939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45736 (or 45727 counting only the distinct ones).

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

The square root of 505878939 is about 22491.7526884856. The cubic root of 505878939 is about 796.7991577370.

The spelling of 505878939 in words is "five hundred five million, eight hundred seventy-eight thousand, nine hundred thirty-nine".