6409640 has 32 divisors (see below), whose sum is σ = 15050880. Its totient is φ = 2452032.

The previous prime is 6409633. The next prime is 6409643. The reversal of 6409640 is 469046.

It is not an unprimeable number, because it can be changed into a prime (6409643) 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, 2564 + ... + 4403.

It is an arithmetic number, because the mean of its divisors is an integer number (470340).

Almost surely, 2^6409640 is an apocalyptic number.

It is an amenable number.

6409640 is an abundant number, since it is smaller than the sum of its proper divisors (8641240).

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

6409640 is a wasteful number, since it uses less digits than its factorization.

6409640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001 (or 6997 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 6409640 is about 2531.7266835107. The cubic root of 6409640 is about 185.7567251559.

The spelling of 6409640 in words is "six million, four hundred nine thousand, six hundred forty".