6440041 has 2 divisors, whose sum is σ = 6440042. Its totient is φ = 6440040.

The previous prime is 6440039. The next prime is 6440089. The reversal of 6440041 is 1400446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5221225 + 1218816 = 2285^2 + 1104^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440041 - 2¹ = 6440039 is a prime.

Together with 6440039, it forms a pair of twin primes.

6440041 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6440011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220020 + 3220021.

It is an arithmetic number, because the mean of its divisors is an integer number (3220021).

Almost surely, 2^6440041 is an apocalyptic number.

It is an amenable number.

6440041 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440041 is an equidigital number, since it uses as much as digits as its factorization.

6440041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 6440041 is about 2537.7235862087. The cubic root of 6440041 is about 186.0499441938.

Adding to 6440041 its reverse (1400446), we get a palindrome (7840487).

The spelling of 6440041 in words is "six million, four hundred forty thousand, forty-one".