6489440 has 24 divisors (see below), whose sum is σ = 15331680. Its totient is φ = 2595712.

The previous prime is 6489433. The next prime is 6489449. The reversal of 6489440 is 449846.

It is a super-2 number, since 2×6489440² = 84225663027200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6489440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6489449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20120 + ... + 20439.

It is an arithmetic number, because the mean of its divisors is an integer number (638820).

Almost surely, 2^6489440 is an apocalyptic number.

It is an amenable number.

6489440 is an abundant number, since it is smaller than the sum of its proper divisors (8842240).

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

6489440 is a wasteful number, since it uses less digits than its factorization.

6489440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40574 (or 40566 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 6489440 is about 2547.4379285863. The cubic root of 6489440 is about 186.5244381434.

The spelling of 6489440 in words is "six million, four hundred eighty-nine thousand, four hundred forty".