6438891 has 16 divisors (see below), whose sum is σ = 9152640. Its totient is φ = 4014720.

The previous prime is 6438889. The next prime is 6438893. The reversal of 6438891 is 1988346.

It is an interprime number because it is at equal distance from previous prime (6438889) and next prime (6438893).

It is not a de Polignac number, because 6438891 - 2¹ = 6438889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6438893) 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, 4051 + ... + 5411.

It is an arithmetic number, because the mean of its divisors is an integer number (572040).

Almost surely, 2^6438891 is an apocalyptic number.

6438891 is a deficient number, since it is larger than the sum of its proper divisors (2713749).

6438891 is a wasteful number, since it uses less digits than its factorization.

6438891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466.

The product of its digits is 41472, while the sum is 39.

The square root of 6438891 is about 2537.4969950721. The cubic root of 6438891 is about 186.0388692036.

The spelling of 6438891 in words is "six million, four hundred thirty-eight thousand, eight hundred ninety-one".