6445985 has 32 divisors (see below), whose sum is σ = 9848832. Its totient is φ = 3939840.

The previous prime is 6445981. The next prime is 6445991. The reversal of 6445985 is 5895446.

It is a happy number.

It is not a de Polignac number, because 6445985 - 2² = 6445981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6445981) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 13877 + ... + 14333.

It is an arithmetic number, because the mean of its divisors is an integer number (307776).

Almost surely, 2^6445985 is an apocalyptic number.

6445985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6445985 is a deficient number, since it is larger than the sum of its proper divisors (3402847).

6445985 is a wasteful number, since it uses less digits than its factorization.

6445985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513.

The product of its digits is 172800, while the sum is 41.

The square root of 6445985 is about 2538.8944444384. The cubic root of 6445985 is about 186.1071664387.

The spelling of 6445985 in words is "six million, four hundred forty-five thousand, nine hundred eighty-five".