319920005 has 18 divisors (see below), whose sum is σ = 406137618. Its totient is φ = 241889760.

The previous prime is 319919993. The next prime is 319920067. The reversal of 319920005 is 500029913.

It can be written as a sum of positive squares in 3 ways, for example, as 47306884 + 272613121 = 6878^2 + 16511^2 .

It is not a de Polignac number, because 319920005 - 2⁴ = 319919989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 319920005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 759695 + ... + 760115.

It is an arithmetic number, because the mean of its divisors is an integer number (22563201).

Almost surely, 2^319920005 is an apocalyptic number.

It is an amenable number.

319920005 is a deficient number, since it is larger than the sum of its proper divisors (86217613).

319920005 is an frugal number, since it uses more digits than its factorization.

319920005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 319920005 is about 17886.3077520208. The cubic root of 319920005 is about 683.9333782849.

Adding to 319920005 its reverse (500029913), we get a palindrome (819949918).

The spelling of 319920005 in words is "three hundred nineteen million, nine hundred twenty thousand, five".