12840443 has 16 divisors (see below), whose sum is σ = 16445184. Its totient is φ = 9732960.

The previous prime is 12840427. The next prime is 12840461. The reversal of 12840443 is 34404821.

It is a cyclic number.

It is not a de Polignac number, because 12840443 - 2⁴ = 12840427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12840473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 596 + ... + 5102.

It is an arithmetic number, because the mean of its divisors is an integer number (1027824).

Almost surely, 2^12840443 is an apocalyptic number.

12840443 is a deficient number, since it is larger than the sum of its proper divisors (3604741).

12840443 is a wasteful number, since it uses less digits than its factorization.

12840443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4562.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 12840443 is about 3583.3563875227. The cubic root of 12840443 is about 234.1675268068.

The spelling of 12840443 in words is "twelve million, eight hundred forty thousand, four hundred forty-three".