13563403 has 4 divisors (see below), whose sum is σ = 15501040. Its totient is φ = 11625768.

The previous prime is 13563383. The next prime is 13563409. The reversal of 13563403 is 30436531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30436531 = 3313 ⋅9187.

It is not a de Polignac number, because 13563403 - 2⁵ = 13563371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13563409) 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, 968808 + ... + 968821.

It is an arithmetic number, because the mean of its divisors is an integer number (3875260).

Almost surely, 2^13563403 is an apocalyptic number.

13563403 is a deficient number, since it is larger than the sum of its proper divisors (1937637).

13563403 is an equidigital number, since it uses as much as digits as its factorization.

13563403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937636.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 13563403 is about 3682.8525628920. The cubic root of 13563403 is about 238.4823386723.

Adding to 13563403 its reverse (30436531), we get a palindrome (43999934).

The spelling of 13563403 in words is "thirteen million, five hundred sixty-three thousand, four hundred three".