6443967 has 4 divisors (see below), whose sum is σ = 8591960. Its totient is φ = 4295976.

The previous prime is 6443963. The next prime is 6443977. The reversal of 6443967 is 7693446.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6443967 - 2² = 6443963 is a prime.

It is a D-number.

It is a Duffinian number.

6443967 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6443963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073992 + ... + 1073997.

It is an arithmetic number, because the mean of its divisors is an integer number (2147990).

Almost surely, 2^6443967 is an apocalyptic number.

6443967 is a deficient number, since it is larger than the sum of its proper divisors (2147993).

6443967 is a wasteful number, since it uses less digits than its factorization.

6443967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147992.

The product of its digits is 108864, while the sum is 39.

The square root of 6443967 is about 2538.4969962559. The cubic root of 6443967 is about 186.0877433166.

The spelling of 6443967 in words is "six million, four hundred forty-three thousand, nine hundred sixty-seven".