505309643 has 8 divisors (see below), whose sum is σ = 516840960. Its totient is φ = 493810920.

The previous prime is 505309639. The next prime is 505309667. The reversal of 505309643 is 346903505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505309643 - 2² = 505309639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505309603) 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 7 ways as a sum of consecutive naturals, for example, 24698 + ... + 40256.

It is an arithmetic number, because the mean of its divisors is an integer number (64605120).

Almost surely, 2^505309643 is an apocalyptic number.

505309643 is a deficient number, since it is larger than the sum of its proper divisors (11531317).

505309643 is a wasteful number, since it uses less digits than its factorization.

505309643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16297.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 505309643 is about 22479.0934648175. The cubic root of 505309643 is about 796.5001502046.

The spelling of 505309643 in words is "five hundred five million, three hundred nine thousand, six hundred forty-three".