13845009 has 4 divisors (see below), whose sum is σ = 18460016. Its totient is φ = 9230004.

The previous prime is 13845001. The next prime is 13845019. The reversal of 13845009 is 90054831.

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 not a de Polignac number, because 13845009 - 2³ = 13845001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13845001) 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, 2307499 + ... + 2307504.

It is an arithmetic number, because the mean of its divisors is an integer number (4615004).

Almost surely, 2^13845009 is an apocalyptic number.

It is an amenable number.

13845009 is a deficient number, since it is larger than the sum of its proper divisors (4615007).

13845009 is an equidigital number, since it uses as much as digits as its factorization.

13845009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615006.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 13845009 is about 3720.8882004167. Note that the first 3 decimals coincide. The cubic root of 13845009 is about 240.1215183228.

The spelling of 13845009 in words is "thirteen million, eight hundred forty-five thousand, nine".