499999985 has 8 divisors (see below), whose sum is σ = 600470376. Its totient is φ = 399686400.

The previous prime is 499999931. The next prime is 499999993. The reversal of 499999985 is 589999994.

It can be written as a sum of positive squares in 4 ways, for example, as 314849536 + 185150449 = 17744^2 + 13607^2 .

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

It is not a de Polignac number, because 499999985 - 2¹² = 499995889 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 32066 + ... + 45035.

It is an arithmetic number, because the mean of its divisors is an integer number (75058797).

Almost surely, 2^499999985 is an apocalyptic number.

It is an amenable number.

499999985 is a deficient number, since it is larger than the sum of its proper divisors (100470391).

499999985 is a wasteful number, since it uses less digits than its factorization.

499999985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78403.

The product of its digits is 85030560, while the sum is 71.

The square root of 499999985 is about 22360.6794395877. The cubic root of 499999985 is about 793.7005180471.

Subtracting 499999985 from its reverse (589999994), we obtain a palindrome (90000009).

The spelling of 499999985 in words is "four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-five".