6445986 has 32 divisors (see below), whose sum is σ = 13305600. Its totient is φ = 2081040.

The previous prime is 6445981. The next prime is 6445991. The reversal of 6445986 is 6895446.

It is an interprime number because it is at equal distance from previous prime (6445981) and next prime (6445991).

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 15 ways as a sum of consecutive naturals, for example, 46305 + ... + 46443.

It is an arithmetic number, because the mean of its divisors is an integer number (415800).

Almost surely, 2^6445986 is an apocalyptic number.

6445986 is an abundant number, since it is smaller than the sum of its proper divisors (6859614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6445986 is a wasteful number, since it uses less digits than its factorization.

6445986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334.

The product of its digits is 207360, while the sum is 42.

The square root of 6445986 is about 2538.8946413745. The cubic root of 6445986 is about 186.1071760626.

The spelling of 6445986 in words is "six million, four hundred forty-five thousand, nine hundred eighty-six".