403563 has 16 divisors (see below), whose sum is σ = 586656. Its totient is φ = 245760.

The previous prime is 403553. The next prime is 403567. The reversal of 403563 is 365304.

It is not a de Polignac number, because 403563 - 2⁴ = 403547 is a prime.

403563 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1995 + ... + 2187.

It is an arithmetic number, because the mean of its divisors is an integer number (36666).

2⁴⁰³⁵⁶³ is an apocalyptic number.

403563 is a deficient number, since it is larger than the sum of its proper divisors (183093).

403563 is a wasteful number, since it uses less digits than its factorization.

403563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 403563 is about 635.2660859829. The cubic root of 403563 is about 73.8987536740.

Adding to 403563 its reverse (365304), we get a palindrome (768867).

The spelling of 403563 in words is "four hundred three thousand, five hundred sixty-three".