13278809 has 4 divisors (see below), whose sum is σ = 13374480. Its totient is φ = 13183140.

The previous prime is 13278803. The next prime is 13278821. The reversal of 13278809 is 90887231.

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 13278809 - 2¹⁶ = 13213273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13278803) 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, 47627 + ... + 47904.

It is an arithmetic number, because the mean of its divisors is an integer number (3343620).

Almost surely, 2^13278809 is an apocalyptic number.

It is an amenable number.

13278809 is a deficient number, since it is larger than the sum of its proper divisors (95671).

13278809 is an equidigital number, since it uses as much as digits as its factorization.

13278809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95670.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 13278809 is about 3644.0100164517. The cubic root of 13278809 is about 236.8025499729.

The spelling of 13278809 in words is "thirteen million, two hundred seventy-eight thousand, eight hundred nine".