2665440 has 96 divisors (see below), whose sum is σ = 9344160. Its totient is φ = 709632.

The previous prime is 2665433. The next prime is 2665459. The reversal of 2665440 is 445662.

It is a happy number.

2665440 is a `hidden beast` number, since 2 + 6 + 654 + 4 + 0 = 666.

2665440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4012 + ... + 4628.

It is an arithmetic number, because the mean of its divisors is an integer number (97335).

2^2665440 is an apocalyptic number.

2665440 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 2665440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4672080).

2665440 is an abundant number, since it is smaller than the sum of its proper divisors (6678720).

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

2665440 is a wasteful number, since it uses less digits than its factorization.

2665440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 2665440 is about 1632.6175302256. The cubic root of 2665440 is about 138.6509885299.

The spelling of 2665440 in words is "two million, six hundred sixty-five thousand, four hundred forty".