6491985 has 8 divisors (see below), whose sum is σ = 10387200. Its totient is φ = 3462384.

The previous prime is 6491971. The next prime is 6491993. The reversal of 6491985 is 5891946.

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

It is not a de Polignac number, because 6491985 - 2⁷ = 6491857 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216385 + ... + 216414.

It is an arithmetic number, because the mean of its divisors is an integer number (1298400).

Almost surely, 2^6491985 is an apocalyptic number.

It is an amenable number.

6491985 is a deficient number, since it is larger than the sum of its proper divisors (3895215).

6491985 is a wasteful number, since it uses less digits than its factorization.

6491985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432807.

The product of its digits is 77760, while the sum is 42.

The square root of 6491985 is about 2547.9374011149. The cubic root of 6491985 is about 186.5488184008.

The spelling of 6491985 in words is "six million, four hundred ninety-one thousand, nine hundred eighty-five".