6440271 has 8 divisors (see below), whose sum is σ = 8637360. Its totient is φ = 4268352.

The previous prime is 6440249. The next prime is 6440303. The reversal of 6440271 is 1720446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6440271 - 2⁷ = 6440143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440201) 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 7 ways as a sum of consecutive naturals, for example, 5686 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (1079670).

Almost surely, 2^6440271 is an apocalyptic number.

6440271 is a deficient number, since it is larger than the sum of its proper divisors (2197089).

6440271 is a wasteful number, since it uses less digits than its factorization.

6440271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12585.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 6440271 is about 2537.7689020082. The cubic root of 6440271 is about 186.0521590336.

The spelling of 6440271 in words is "six million, four hundred forty thousand, two hundred seventy-one".