6438671 has 4 divisors (see below), whose sum is σ = 6575712. Its totient is φ = 6301632.

The previous prime is 6438661. The next prime is 6438697. The reversal of 6438671 is 1768346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6438671 - 2²² = 2244367 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 (6438661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68450 + ... + 68543.

It is an arithmetic number, because the mean of its divisors is an integer number (1643928).

Almost surely, 2^6438671 is an apocalyptic number.

6438671 is a deficient number, since it is larger than the sum of its proper divisors (137041).

6438671 is a wasteful number, since it uses less digits than its factorization.

6438671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137040.

The product of its digits is 24192, while the sum is 35.

The square root of 6438671 is about 2537.4536448968. The cubic root of 6438671 is about 186.0367503596.

The spelling of 6438671 in words is "six million, four hundred thirty-eight thousand, six hundred seventy-one".