12307281 has 24 divisors (see below), whose sum is σ = 19753920. Its totient is φ = 6787872.

The previous prime is 12307271. The next prime is 12307301. The reversal of 12307281 is 18270321.

12307281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12307281 - 2⁹ = 12306769 is a prime.

It is a super-2 number, since 2×12307281² = 302938331225922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12307261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2820 + ... + 5706.

It is an arithmetic number, because the mean of its divisors is an integer number (823080).

Almost surely, 2^12307281 is an apocalyptic number.

It is an amenable number.

12307281 is a deficient number, since it is larger than the sum of its proper divisors (7446639).

12307281 is a wasteful number, since it uses less digits than its factorization.

12307281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2933 (or 2926 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12307281 is about 3508.1734563730. The cubic root of 12307281 is about 230.8805626823.

The spelling of 12307281 in words is "twelve million, three hundred seven thousand, two hundred eighty-one".