12428281 has 4 divisors (see below), whose sum is σ = 12469072. Its totient is φ = 12387492.

The previous prime is 12428279. The next prime is 12428287. The reversal of 12428281 is 18282421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12428281 - 2¹ = 12428279 is a prime.

It is a super-2 number, since 2×12428281² = 308924337229922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12428287) 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, 19935 + ... + 20548.

It is an arithmetic number, because the mean of its divisors is an integer number (3117268).

Almost surely, 2^12428281 is an apocalyptic number.

It is an amenable number.

12428281 is a deficient number, since it is larger than the sum of its proper divisors (40791).

12428281 is an equidigital number, since it uses as much as digits as its factorization.

12428281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40790.

The product of its digits is 2048, while the sum is 28.

The square root of 12428281 is about 3525.3767174587. The cubic root of 12428281 is about 231.6347366123.

The spelling of 12428281 in words is "twelve million, four hundred twenty-eight thousand, two hundred eighty-one".