6443689 has 8 divisors (see below), whose sum is σ = 7447680. Its totient is φ = 5460576.

The previous prime is 6443677. The next prime is 6443719. The reversal of 6443689 is 9863446.

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

It is a cyclic number.

It is not a de Polignac number, because 6443689 - 2¹³ = 6435497 is a prime.

It is a super-2 number, since 2×6443689² = 83042255857442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6443639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4549 + ... + 5794.

It is an arithmetic number, because the mean of its divisors is an integer number (930960).

Almost surely, 2^6443689 is an apocalyptic number.

It is an amenable number.

6443689 is a deficient number, since it is larger than the sum of its proper divisors (1003991).

6443689 is a wasteful number, since it uses less digits than its factorization.

6443689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10439.

The product of its digits is 124416, while the sum is 40.

The square root of 6443689 is about 2538.4422388544. The cubic root of 6443689 is about 186.0850672665.

The spelling of 6443689 in words is "six million, four hundred forty-three thousand, six hundred eighty-nine".