505039805 has 4 divisors (see below), whose sum is σ = 606047772. Its totient is φ = 404031840.

The previous prime is 505039771. The next prime is 505039813. The reversal of 505039805 is 508930505.

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

It can be written as a sum of positive squares in 2 ways, for example, as 389391289 + 115648516 = 19733^2 + 10754^2 .

It is not a de Polignac number, because 505039805 - 2¹⁸ = 504777661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 50503976 + ... + 50503985.

It is an arithmetic number, because the mean of its divisors is an integer number (151511943).

Almost surely, 2^505039805 is an apocalyptic number.

It is an amenable number.

505039805 is a deficient number, since it is larger than the sum of its proper divisors (101007967).

505039805 is a wasteful number, since it uses less digits than its factorization.

505039805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101007966.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 505039805 is about 22473.0906864187. The cubic root of 505039805 is about 796.3583465409.

The spelling of 505039805 in words is "five hundred five million, thirty-nine thousand, eight hundred five".