6440173 has 4 divisors (see below), whose sum is σ = 6447168. Its totient is φ = 6433180.

The previous prime is 6440171. The next prime is 6440177. The reversal of 6440173 is 3710446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6440173 - 2¹ = 6440171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440171) 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, 1861 + ... + 4042.

It is an arithmetic number, because the mean of its divisors is an integer number (1611792).

Almost surely, 2^6440173 is an apocalyptic number.

It is an amenable number.

6440173 is a deficient number, since it is larger than the sum of its proper divisors (6995).

6440173 is a wasteful number, since it uses less digits than its factorization.

6440173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6994.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 6440173 is about 2537.7495936361. The cubic root of 6440173 is about 186.0512153257.

The spelling of 6440173 in words is "six million, four hundred forty thousand, one hundred seventy-three".