13813909 has 4 divisors (see below), whose sum is σ = 13857804. Its totient is φ = 13770016.

The previous prime is 13813903. The next prime is 13813927. The reversal of 13813909 is 90931831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90931831 = 751 ⋅121081.

It can be written as a sum of positive squares in 2 ways, for example, as 1932100 + 11881809 = 1390^2 + 3447^2 .

It is a cyclic number.

It is not a de Polignac number, because 13813909 - 2³ = 13813901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13813901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21472 + ... + 22105.

It is an arithmetic number, because the mean of its divisors is an integer number (3464451).

Almost surely, 2^13813909 is an apocalyptic number.

It is an amenable number.

13813909 is a deficient number, since it is larger than the sum of its proper divisors (43895).

13813909 is an equidigital number, since it uses as much as digits as its factorization.

13813909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43894.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 13813909 is about 3716.7067411890. The cubic root of 13813909 is about 239.9415887943.

The spelling of 13813909 in words is "thirteen million, eight hundred thirteen thousand, nine hundred nine".