12781282 has 4 divisors (see below), whose sum is σ = 19171926. Its totient is φ = 6390640.

The previous prime is 12781271. The next prime is 12781291. The reversal of 12781282 is 28218721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28218721 = 79 ⋅357199.

It can be written as a sum of positive squares in only one way, i.e., 12752041 + 29241 = 3571^2 + 171^2 .

It is a super-2 number, since 2×12781282² = 326722339127048, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195319 + ... + 3195322.

Almost surely, 2^12781282 is an apocalyptic number.

12781282 is a deficient number, since it is larger than the sum of its proper divisors (6390644).

12781282 is an equidigital number, since it uses as much as digits as its factorization.

12781282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6390643.

The product of its digits is 3584, while the sum is 31.

The square root of 12781282 is about 3575.0918869310. The cubic root of 12781282 is about 233.8073389224.

The spelling of 12781282 in words is "twelve million, seven hundred eighty-one thousand, two hundred eighty-two".