6443691 has 16 divisors (see below), whose sum is σ = 8939520. Its totient is φ = 4124160.

The previous prime is 6443677. The next prime is 6443719. The reversal of 6443691 is 1963446.

It is not a de Polignac number, because 6443691 - 2¹⁷ = 6312619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6443621) 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, 17770 + ... + 18128.

It is an arithmetic number, because the mean of its divisors is an integer number (558720).

Almost surely, 2^6443691 is an apocalyptic number.

6443691 is a deficient number, since it is larger than the sum of its proper divisors (2495829).

6443691 is a wasteful number, since it uses less digits than its factorization.

6443691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586.

The product of its digits is 15552, while the sum is 33.

The square root of 6443691 is about 2538.4426327967. The cubic root of 6443691 is about 186.0850865189.

The spelling of 6443691 in words is "six million, four hundred forty-three thousand, six hundred ninety-one".