12427281 has 12 divisors (see below), whose sum is σ = 18289908. Its totient is φ = 8128224.

The previous prime is 12427277. The next prime is 12427297. The reversal of 12427281 is 18272421.

It can be written as a sum of positive squares in 2 ways, for example, as 9734400 + 2692881 = 3120^2 + 1641^2 .

It is not a de Polignac number, because 12427281 - 2² = 12427277 is a prime.

It is a super-2 number, since 2×12427281² = 308874626105922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (12427211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12550 + ... + 13503.

It is an arithmetic number, because the mean of its divisors is an integer number (1524159).

Almost surely, 2^12427281 is an apocalyptic number.

It is an amenable number.

12427281 is a deficient number, since it is larger than the sum of its proper divisors (5862627).

12427281 is a wasteful number, since it uses less digits than its factorization.

12427281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26112 (or 26109 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 12427281 is about 3525.2348857913. The cubic root of 12427281 is about 231.6285238746.

The spelling of 12427281 in words is "twelve million, four hundred twenty-seven thousand, two hundred eighty-one".