6549840 has 120 divisors (see below), whose sum is σ = 24025248. Its totient is φ = 1585920.

The previous prime is 6549839. The next prime is 6549857. The reversal of 6549840 is 489456.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6549795 and 6549804.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7507 + ... + 8333.

Almost surely, 2^6549840 is an apocalyptic number.

6549840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6549840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12012624).

6549840 is an abundant number, since it is smaller than the sum of its proper divisors (17475408).

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

6549840 is a wasteful number, since it uses less digits than its factorization.

6549840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 6549840 is about 2559.2655196364. The cubic root of 6549840 is about 187.1013396403.

The spelling of 6549840 in words is "six million, five hundred forty-nine thousand, eight hundred forty".