6449639 has 16 divisors (see below), whose sum is σ = 7603200. Its totient is φ = 5357664.

The previous prime is 6449617. The next prime is 6449659. The reversal of 6449639 is 9369446.

It is a cyclic number.

It is not a de Polignac number, because 6449639 - 2²⁰ = 5401063 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6449596 and 6449605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6449659) 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 15 ways as a sum of consecutive naturals, for example, 59117 + ... + 59225.

It is an arithmetic number, because the mean of its divisors is an integer number (475200).

Almost surely, 2^6449639 is an apocalyptic number.

6449639 is a deficient number, since it is larger than the sum of its proper divisors (1153561).

6449639 is a wasteful number, since it uses less digits than its factorization.

6449639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302.

The product of its digits is 139968, while the sum is 41.

The square root of 6449639 is about 2539.6139470400. The cubic root of 6449639 is about 186.1423256440.

The spelling of 6449639 in words is "six million, four hundred forty-nine thousand, six hundred thirty-nine".