12878281 has 4 divisors (see below), whose sum is σ = 13868932. Its totient is φ = 11887632.

The previous prime is 12878267. The next prime is 12878287. The reversal of 12878281 is 18287821.

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 8294400 + 4583881 = 2880^2 + 2141^2 .

It is a cyclic number.

It is not a de Polignac number, because 12878281 - 2⁷ = 12878153 is a prime.

It is a super-2 number, since 2×12878281² = 331700243029922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12878281.

It is not an unprimeable number, because it can be changed into a prime (12878287) 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, 495306 + ... + 495331.

It is an arithmetic number, because the mean of its divisors is an integer number (3467233).

Almost surely, 2^12878281 is an apocalyptic number.

It is an amenable number.

12878281 is a deficient number, since it is larger than the sum of its proper divisors (990651).

12878281 is an equidigital number, since it uses as much as digits as its factorization.

12878281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990650.

The product of its digits is 14336, while the sum is 37.

The square root of 12878281 is about 3588.6321906821. The cubic root of 12878281 is about 234.3973148768.

The spelling of 12878281 in words is "twelve million, eight hundred seventy-eight thousand, two hundred eighty-one".