6543967 has 4 divisors (see below), whose sum is σ = 6549120. Its totient is φ = 6538816.

The previous prime is 6543947. The next prime is 6543973. The reversal of 6543967 is 7693456.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6543967 - 2¹⁹ = 6019679 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

6543967 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543907) 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, 834 + ... + 3712.

It is an arithmetic number, because the mean of its divisors is an integer number (1637280).

Almost surely, 2^6543967 is an apocalyptic number.

6543967 is a deficient number, since it is larger than the sum of its proper divisors (5153).

6543967 is a wasteful number, since it uses less digits than its factorization.

6543967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5152.

The product of its digits is 136080, while the sum is 40.

The square root of 6543967 is about 2558.1178628046. The cubic root of 6543967 is about 187.0454006269.

The spelling of 6543967 in words is "six million, five hundred forty-three thousand, nine hundred sixty-seven".