6444686 has 16 divisors (see below), whose sum is σ = 10242960. Its totient is φ = 3032640.

The previous prime is 6444679. The next prime is 6444689. The reversal of 6444686 is 6864446.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444689) 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 7 ways as a sum of consecutive naturals, for example, 6410 + ... + 7346.

It is an arithmetic number, because the mean of its divisors is an integer number (640185).

Almost surely, 2^6444686 is an apocalyptic number.

6444686 is a deficient number, since it is larger than the sum of its proper divisors (3798274).

6444686 is a wasteful number, since it uses less digits than its factorization.

6444686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139.

The product of its digits is 110592, while the sum is 38.

The square root of 6444686 is about 2538.6386115397. The cubic root of 6444686 is about 186.0946641110.

The spelling of 6444686 in words is "six million, four hundred forty-four thousand, six hundred eighty-six".