6439893 has 8 divisors (see below), whose sum is σ = 8769408. Its totient is φ = 4201824.

The previous prime is 6439837. The next prime is 6439903. The reversal of 6439893 is 3989346.

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

It is not a de Polignac number, because 6439893 - 2¹² = 6435797 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439493) 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 7 ways as a sum of consecutive naturals, for example, 22696 + ... + 22977.

It is an arithmetic number, because the mean of its divisors is an integer number (1096176).

Almost surely, 2^6439893 is an apocalyptic number.

It is an amenable number.

6439893 is a deficient number, since it is larger than the sum of its proper divisors (2329515).

6439893 is a wasteful number, since it uses less digits than its factorization.

6439893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45723.

The product of its digits is 139968, while the sum is 42.

The square root of 6439893 is about 2537.6944260490. The cubic root of 6439893 is about 186.0485189647.

The spelling of 6439893 in words is "six million, four hundred thirty-nine thousand, eight hundred ninety-three".