2655440 has 40 divisors (see below), whose sum is σ = 6502560. Its totient is φ = 1005696.

The previous prime is 2655439. The next prime is 2655449. The reversal of 2655440 is 445562.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2655449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 647 + ... + 2393.

It is an arithmetic number, because the mean of its divisors is an integer number (162564).

2^2655440 is an apocalyptic number.

2655440 is a gapful number since it is divisible by the number (20) 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 2655440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3251280).

2655440 is an abundant number, since it is smaller than the sum of its proper divisors (3847120).

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

2655440 is a wasteful number, since it uses less digits than its factorization.

2655440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779 (or 1773 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 2655440 is about 1629.5520856972. The cubic root of 2655440 is about 138.4773777385.

The spelling of 2655440 in words is "two million, six hundred fifty-five thousand, four hundred forty".