12840881 has 4 divisors (see below), whose sum is σ = 13283700. Its totient is φ = 12398064.

The previous prime is 12840871. The next prime is 12840911. The reversal of 12840881 is 18804821.

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 8179600 + 4661281 = 2860^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 12840881 - 2¹⁰ = 12839857 is a prime.

It is a super-2 number, since 2×12840881² = 329776449712322, 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 (12840811) 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, 221366 + ... + 221423.

It is an arithmetic number, because the mean of its divisors is an integer number (3320925).

Almost surely, 2^12840881 is an apocalyptic number.

It is an amenable number.

12840881 is a deficient number, since it is larger than the sum of its proper divisors (442819).

12840881 is an equidigital number, since it uses as much as digits as its factorization.

12840881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442818.

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 12840881 is about 3583.4175028874. The cubic root of 12840881 is about 234.1701893373.

The spelling of 12840881 in words is "twelve million, eight hundred forty thousand, eight hundred eighty-one".