12840817 has 4 divisors (see below), whose sum is σ = 14008176. Its totient is φ = 11673460.

The previous prime is 12840811. The next prime is 12840833. The reversal of 12840817 is 71804821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12840817 - 2⁷ = 12840689 is a prime.

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 a Duffinian 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, 583663 + ... + 583684.

It is an arithmetic number, because the mean of its divisors is an integer number (3502044).

Almost surely, 2^12840817 is an apocalyptic number.

It is an amenable number.

12840817 is a deficient number, since it is larger than the sum of its proper divisors (1167359).

12840817 is a wasteful number, since it uses less digits than its factorization.

12840817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1167358.

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

The square root of 12840817 is about 3583.4085728535. The cubic root of 12840817 is about 234.1698002955.

The spelling of 12840817 in words is "twelve million, eight hundred forty thousand, eight hundred seventeen".