13405863 has 4 divisors (see below), whose sum is σ = 17874488. Its totient is φ = 8937240.

The previous prime is 13405853. The next prime is 13405867. The reversal of 13405863 is 36850431.

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

It is not a de Polignac number, because 13405863 - 2⁸ = 13405607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13405863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13405867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234308 + ... + 2234313.

It is an arithmetic number, because the mean of its divisors is an integer number (4468622).

Almost surely, 2^13405863 is an apocalyptic number.

13405863 is a deficient number, since it is larger than the sum of its proper divisors (4468625).

13405863 is an equidigital number, since it uses as much as digits as its factorization.

13405863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468624.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 13405863 is about 3661.4017807392. The cubic root of 13405863 is about 237.5554101555. Note that the first 3 decimals are identical.

The spelling of 13405863 in words is "thirteen million, four hundred five thousand, eight hundred sixty-three".