13865009 has 4 divisors (see below), whose sum is σ = 13887216. Its totient is φ = 13842804.

The previous prime is 13864999. The next prime is 13865017. The reversal of 13865009 is 90056831.

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 13865009 - 2⁴ = 13864993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13865039) 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, 10139 + ... + 11424.

It is an arithmetic number, because the mean of its divisors is an integer number (3471804).

Almost surely, 2^13865009 is an apocalyptic number.

It is an amenable number.

13865009 is a deficient number, since it is larger than the sum of its proper divisors (22207).

13865009 is an equidigital number, since it uses as much as digits as its factorization.

13865009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22206.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 13865009 is about 3723.5747608985. The cubic root of 13865009 is about 240.2370863167.

The spelling of 13865009 in words is "thirteen million, eight hundred sixty-five thousand, nine".