6440917 has 8 divisors (see below), whose sum is σ = 7378112. Its totient is φ = 5508000.

The previous prime is 6440893. The next prime is 6440933. The reversal of 6440917 is 7190446.

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

It is a cyclic number.

It is not a de Polignac number, because 6440917 - 2⁷ = 6440789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3442 + ... + 4972.

It is an arithmetic number, because the mean of its divisors is an integer number (922264).

Almost surely, 2^6440917 is an apocalyptic number.

It is an amenable number.

6440917 is a deficient number, since it is larger than the sum of its proper divisors (937195).

6440917 is a wasteful number, since it uses less digits than its factorization.

6440917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 6440917 is about 2537.8961759694. The cubic root of 6440917 is about 186.0583795626.

The spelling of 6440917 in words is "six million, four hundred forty thousand, nine hundred seventeen".