12429281 has 4 divisors (see below), whose sum is σ = 12450564. Its totient is φ = 12408000.

The previous prime is 12429259. The next prime is 12429283. The reversal of 12429281 is 18292421.

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 5564881 + 6864400 = 2359^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 12429281 - 2⁶ = 12429217 is a prime.

It is a super-2 number, since 2×12429281² = 308974052353922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12429283) 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, 9740 + ... + 10941.

It is an arithmetic number, because the mean of its divisors is an integer number (3112641).

Almost surely, 2^12429281 is an apocalyptic number.

It is an amenable number.

12429281 is a deficient number, since it is larger than the sum of its proper divisors (21283).

12429281 is an equidigital number, since it uses as much as digits as its factorization.

12429281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21282.

The product of its digits is 2304, while the sum is 29.

The square root of 12429281 is about 3525.5185434202. The cubic root of 12429281 is about 231.6409490167.

The spelling of 12429281 in words is "twelve million, four hundred twenty-nine thousand, two hundred eighty-one".