13784809 has 4 divisors (see below), whose sum is σ = 13973716. Its totient is φ = 13595904.

The previous prime is 13784761. The next prime is 13784821. The reversal of 13784809 is 90848731.

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 10989225 + 2795584 = 3315^2 + 1672^2 .

It is a cyclic number.

It is not a de Polignac number, because 13784809 - 2¹¹ = 13782761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13784839) 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, 94344 + ... + 94489.

It is an arithmetic number, because the mean of its divisors is an integer number (3493429).

Almost surely, 2^13784809 is an apocalyptic number.

It is an amenable number.

13784809 is a deficient number, since it is larger than the sum of its proper divisors (188907).

13784809 is an equidigital number, since it uses as much as digits as its factorization.

13784809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188906.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 13784809 is about 3712.7899213395. The cubic root of 13784809 is about 239.7729855677.

The spelling of 13784809 in words is "thirteen million, seven hundred eighty-four thousand, eight hundred nine".