13228809 has 16 divisors (see below), whose sum is σ = 19406784. Its totient is φ = 8015040.

The previous prime is 13228801. The next prime is 13228819. The reversal of 13228809 is 90882231.

13228809 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13228809 - 2³ = 13228801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13228809.

It is not an unprimeable number, because it can be changed into a prime (13228801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2337 + ... + 5649.

It is an arithmetic number, because the mean of its divisors is an integer number (1212924).

Almost surely, 2^13228809 is an apocalyptic number.

It is an amenable number.

13228809 is a deficient number, since it is larger than the sum of its proper divisors (6177975).

13228809 is an equidigital number, since it uses as much as digits as its factorization.

13228809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349 (or 3327 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 13228809 is about 3637.1429721692. The cubic root of 13228809 is about 236.5049575308.

It can be divided in two parts, 13 and 228809, that added together give a palindrome (228822).

The spelling of 13228809 in words is "thirteen million, two hundred twenty-eight thousand, eight hundred nine".