6444891 has 12 divisors (see below), whose sum is σ = 9379032. Its totient is φ = 4264416.

The previous prime is 6444871. The next prime is 6444937. The reversal of 6444891 is 1984446.

It is a happy number.

6444891 is a `hidden beast` number, since 644 + 4 + 8 + 9 + 1 = 666.

It is not a de Polignac number, because 6444891 - 2⁵ = 6444859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6444871) 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 11 ways as a sum of consecutive naturals, for example, 1381 + ... + 3846.

It is an arithmetic number, because the mean of its divisors is an integer number (781586).

Almost surely, 2^6444891 is an apocalyptic number.

6444891 is a deficient number, since it is larger than the sum of its proper divisors (2934141).

6444891 is a wasteful number, since it uses less digits than its factorization.

6444891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370 (or 5367 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 6444891 is about 2538.6789871900. The cubic root of 6444891 is about 186.0966372612.

The spelling of 6444891 in words is "six million, four hundred forty-four thousand, eight hundred ninety-one".