12684281 has 4 divisors (see below), whose sum is σ = 13121700. Its totient is φ = 12246864.

The previous prime is 12684277. The next prime is 12684283. The reversal of 12684281 is 18248621.

It is a happy number.

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 4326400 + 8357881 = 2080^2 + 2891^2 .

It is a cyclic number.

It is not a de Polignac number, because 12684281 - 2² = 12684277 is a prime.

It is a super-2 number, since 2×12684281² = 321781968973922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12684283) 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, 218666 + ... + 218723.

It is an arithmetic number, because the mean of its divisors is an integer number (3280425).

Almost surely, 2^12684281 is an apocalyptic number.

It is an amenable number.

12684281 is a deficient number, since it is larger than the sum of its proper divisors (437419).

12684281 is an equidigital number, since it uses as much as digits as its factorization.

12684281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437418.

The product of its digits is 6144, while the sum is 32.

The square root of 12684281 is about 3561.4998245121. The cubic root of 12684281 is about 233.2143581665.

The spelling of 12684281 in words is "twelve million, six hundred eighty-four thousand, two hundred eighty-one".