6440843 has 4 divisors (see below), whose sum is σ = 6487320. Its totient is φ = 6394368.

The previous prime is 6440831. The next prime is 6440873. The reversal of 6440843 is 3480446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3480446 = 2 ⋅1740223.

It is a cyclic number.

It is not a de Polignac number, because 6440843 - 2⁶ = 6440779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440803) 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 in 3 ways as a sum of consecutive naturals, for example, 23030 + ... + 23307.

It is an arithmetic number, because the mean of its divisors is an integer number (1621830).

Almost surely, 2^6440843 is an apocalyptic number.

6440843 is a deficient number, since it is larger than the sum of its proper divisors (46477).

6440843 is a wasteful number, since it uses less digits than its factorization.

6440843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46476.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 6440843 is about 2537.8815969229. The cubic root of 6440843 is about 186.0576670153.

The spelling of 6440843 in words is "six million, four hundred forty thousand, eight hundred forty-three".