6439916 has 24 divisors (see below), whose sum is σ = 12988416. Its totient is φ = 2736720.

The previous prime is 6439903. The next prime is 6439919. The reversal of 6439916 is 6199346.

It is a self number, because there is not a number n which added to its sum of digits gives 6439916.

It is not an unprimeable number, because it can be changed into a prime (6439919) 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, 2651 + ... + 4461.

It is an arithmetic number, because the mean of its divisors is an integer number (541184).

Almost surely, 2^6439916 is an apocalyptic number.

It is an amenable number.

6439916 is an abundant number, since it is smaller than the sum of its proper divisors (6548500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6439916 is a wasteful number, since it uses less digits than its factorization.

6439916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949 (or 1947 counting only the distinct ones).

The product of its digits is 34992, while the sum is 38.

The square root of 6439916 is about 2537.6989577174. The cubic root of 6439916 is about 186.0487404544.

The spelling of 6439916 in words is "six million, four hundred thirty-nine thousand, nine hundred sixteen".