6406543 has 16 divisors (see below), whose sum is σ = 7644672. Its totient is φ = 5292000.

The previous prime is 6406529. The next prime is 6406549. The reversal of 6406543 is 3456046.

It is a cyclic number.

It is not a de Polignac number, because 6406543 - 2²¹ = 4309391 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406549) 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, 9838 + ... + 10468.

It is an arithmetic number, because the mean of its divisors is an integer number (477792).

Almost surely, 2^6406543 is an apocalyptic number.

6406543 is a deficient number, since it is larger than the sum of its proper divisors (1238129).

6406543 is a wasteful number, since it uses less digits than its factorization.

6406543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 6406543 is about 2531.1149717071. The cubic root of 6406543 is about 185.7268024531.

The spelling of 6406543 in words is "six million, four hundred six thousand, five hundred forty-three".