6440871 has 16 divisors (see below), whose sum is σ = 8984160. Its totient is φ = 4099200.

The previous prime is 6440831. The next prime is 6440873. The reversal of 6440871 is 1780446.

It is not a de Polignac number, because 6440871 - 2⁹ = 6440359 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8421 + ... + 9153.

It is an arithmetic number, because the mean of its divisors is an integer number (561510).

Almost surely, 2^6440871 is an apocalyptic number.

6440871 is a deficient number, since it is larger than the sum of its proper divisors (2543289).

6440871 is a wasteful number, since it uses less digits than its factorization.

6440871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 6440871 is about 2537.8871133287. The cubic root of 6440871 is about 186.0579366284.

The spelling of 6440871 in words is "six million, four hundred forty thousand, eight hundred seventy-one".