12087809 has 4 divisors (see below), whose sum is σ = 12504660. Its totient is φ = 11670960.

The previous prime is 12087793. The next prime is 12087839. The reversal of 12087809 is 90878021.

It is a happy number.

12087809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90878021 = 13 ⋅6990617.

It can be written as a sum of positive squares in 2 ways, for example, as 2496400 + 9591409 = 1580^2 + 3097^2 .

It is a cyclic number.

It is not a de Polignac number, because 12087809 - 2⁴ = 12087793 is a prime.

It is a super-2 number, since 2×12087809² = 292230252840962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12087839) 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, 208382 + ... + 208439.

It is an arithmetic number, because the mean of its divisors is an integer number (3126165).

Almost surely, 2^12087809 is an apocalyptic number.

It is an amenable number.

12087809 is a deficient number, since it is larger than the sum of its proper divisors (416851).

12087809 is an equidigital number, since it uses as much as digits as its factorization.

12087809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416850.

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

The square root of 12087809 is about 3476.7526515414. The cubic root of 12087809 is about 229.4999153538.

The spelling of 12087809 in words is "twelve million, eighty-seven thousand, eight hundred nine".