12781276 has 6 divisors (see below), whose sum is σ = 22367240. Its totient is φ = 6390636.

The previous prime is 12781271. The next prime is 12781291. The reversal of 12781276 is 67218721.

It is a happy number.

It is a super-2 number, since 2×12781276² = 326722032376352, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1597656 + ... + 1597663.

Almost surely, 2^12781276 is an apocalyptic number.

It is an amenable number.

12781276 is a deficient number, since it is larger than the sum of its proper divisors (9585964).

12781276 is a wasteful number, since it uses less digits than its factorization.

12781276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195323 (or 3195321 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The square root of 12781276 is about 3575.0910477917. The cubic root of 12781276 is about 233.8073023365.

Adding to 12781276 its reverse (67218721), we get a palindrome (79999997).

The spelling of 12781276 in words is "twelve million, seven hundred eighty-one thousand, two hundred seventy-six".