6403563 has 12 divisors (see below), whose sum is σ = 9506280. Its totient is φ = 4260276.

The previous prime is 6403511. The next prime is 6403571. The reversal of 6403563 is 3653046.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 6403563 - 2⁹ = 6403051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (6403063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12906 + ... + 13392.

It is an arithmetic number, because the mean of its divisors is an integer number (792190).

Almost surely, 2^6403563 is an apocalyptic number.

6403563 is a deficient number, since it is larger than the sum of its proper divisors (3102717).

6403563 is an frugal number, since it uses more digits than its factorization.

6403563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

The square root of 6403563 is about 2530.5262298581. The cubic root of 6403563 is about 185.6980010798.

Multiplying 6403563 by its sum of digits (27), we get a square (172896201 = 13149²).

6403563 divided by its sum of digits (27) gives a square (237169 = 487²).

The spelling of 6403563 in words is "six million, four hundred three thousand, five hundred sixty-three".