12420281 has 8 divisors (see below), whose sum is σ = 13106400. Its totient is φ = 11737440.

The previous prime is 12420277. The next prime is 12420311. The reversal of 12420281 is 18202421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12420281 - 2² = 12420277 is a prime.

It is a super-2 number, since 2×12420281² = 308526760237922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12420211) 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 7 ways as a sum of consecutive naturals, for example, 14030 + ... + 14888.

It is an arithmetic number, because the mean of its divisors is an integer number (1638300).

Almost surely, 2^12420281 is an apocalyptic number.

It is an amenable number.

12420281 is a deficient number, since it is larger than the sum of its proper divisors (686119).

12420281 is an equidigital number, since it uses as much as digits as its factorization.

12420281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 12420281 is about 3524.2419042966. The cubic root of 12420281 is about 231.5850253760.

The spelling of 12420281 in words is "twelve million, four hundred twenty thousand, two hundred eighty-one".