12078809 has 6 divisors (see below), whose sum is σ = 12482010. Its totient is φ = 11688240.

The previous prime is 12078791. The next prime is 12078853. The reversal of 12078809 is 90887021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12054784 + 24025 = 3472^2 + 155^2 .

It is not a de Polignac number, because 12078809 - 2¹⁶ = 12013273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12078709) 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 5 ways as a sum of consecutive naturals, for example, 5324 + ... + 7245.

It is an arithmetic number, because the mean of its divisors is an integer number (2080335).

Almost surely, 2^12078809 is an apocalyptic number.

It is an amenable number.

12078809 is a deficient number, since it is larger than the sum of its proper divisors (403201).

12078809 is an equidigital number, since it uses as much as digits as its factorization.

12078809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12631 (or 12600 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 12078809 is about 3475.4580993014. The cubic root of 12078809 is about 229.4429430199.

The spelling of 12078809 in words is "twelve million, seventy-eight thousand, eight hundred nine".