13903609 has 4 divisors (see below), whose sum is σ = 13945204. Its totient is φ = 13862016.

The previous prime is 13903607. The next prime is 13903613. The reversal of 13903609 is 90630931.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4000000 + 9903609 = 2000^2 + 3147^2 .

It is a cyclic number.

It is not a de Polignac number, because 13903609 - 2¹ = 13903607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13903607) 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, 20292 + ... + 20965.

It is an arithmetic number, because the mean of its divisors is an integer number (3486301).

Almost surely, 2^13903609 is an apocalyptic number.

It is an amenable number.

13903609 is a deficient number, since it is larger than the sum of its proper divisors (41595).

13903609 is an equidigital number, since it uses as much as digits as its factorization.

13903609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41594.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 13903609 is about 3728.7543496455. The cubic root of 13903609 is about 240.4598186971.

The spelling of 13903609 in words is "thirteen million, nine hundred three thousand, six hundred nine".