13865909 has 4 divisors (see below), whose sum is σ = 14188416. Its totient is φ = 13543404.

The previous prime is 13865881. The next prime is 13865911. The reversal of 13865909 is 90956831.

13865909 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13865909 - 2⁸ = 13865653 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 (13865989) 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, 161189 + ... + 161274.

It is an arithmetic number, because the mean of its divisors is an integer number (3547104).

Almost surely, 2^13865909 is an apocalyptic number.

It is an amenable number.

13865909 is a deficient number, since it is larger than the sum of its proper divisors (322507).

13865909 is an equidigital number, since it uses as much as digits as its factorization.

13865909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322506.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 13865909 is about 3723.6956105461. The cubic root of 13865909 is about 240.2422842626.

The spelling of 13865909 in words is "thirteen million, eight hundred sixty-five thousand, nine hundred nine".