6551440 has 40 divisors (see below), whose sum is σ = 17409600. Its totient is φ = 2246016.

The previous prime is 6551429. The next prime is 6551497. The reversal of 6551440 is 441556.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5290 + ... + 6409.

It is an arithmetic number, because the mean of its divisors is an integer number (435240).

Almost surely, 2^6551440 is an apocalyptic number.

It is an amenable number.

6551440 is an abundant number, since it is smaller than the sum of its proper divisors (10858160).

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

6551440 is a wasteful number, since it uses less digits than its factorization.

6551440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11719 (or 11713 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 6551440 is about 2559.5780902328. The cubic root of 6551440 is about 187.1165734868.

Adding to 6551440 its reverse (441556), we get a palindrome (6992996).

The spelling of 6551440 in words is "six million, five hundred fifty-one thousand, four hundred forty".