12409281 has 24 divisors (see below), whose sum is σ = 18753280. Its totient is φ = 8199792.

The previous prime is 12409279. The next prime is 12409289. The reversal of 12409281 is 18290421.

It is not a de Polignac number, because 12409281 - 2¹ = 12409279 is a prime.

It is a super-2 number, since 2×12409281² = 307980509873922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12409289) 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 23 ways as a sum of consecutive naturals, for example, 54075 + ... + 54303.

Almost surely, 2^12409281 is an apocalyptic number.

It is an amenable number.

12409281 is a deficient number, since it is larger than the sum of its proper divisors (6343999).

12409281 is an equidigital number, since it uses as much as digits as its factorization.

12409281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 12409281 is about 3522.6809392847. The cubic root of 12409281 is about 231.5166375595.

The spelling of 12409281 in words is "twelve million, four hundred nine thousand, two hundred eighty-one".