6406563 has 4 divisors (see below), whose sum is σ = 8542088. Its totient is φ = 4271040.

The previous prime is 6406549. The next prime is 6406571. The reversal of 6406563 is 3656046.

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

It is not a de Polignac number, because 6406563 - 2⁸ = 6406307 is a prime.

It is a D-number.

It is a Duffinian number.

6406563 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6406563.

It is not an unprimeable number, because it can be changed into a prime (6406573) 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, 1067758 + ... + 1067763.

It is an arithmetic number, because the mean of its divisors is an integer number (2135522).

Almost surely, 2^6406563 is an apocalyptic number.

6406563 is a deficient number, since it is larger than the sum of its proper divisors (2135525).

6406563 is a wasteful number, since it uses less digits than its factorization.

6406563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135524.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 6406563 is about 2531.1189225321. The cubic root of 6406563 is about 185.7269957207.

The spelling of 6406563 in words is "six million, four hundred six thousand, five hundred sixty-three".