11565040 has 20 divisors (see below), whose sum is σ = 26888904. Its totient is φ = 4625984.

The previous prime is 11565031. The next prime is 11565041. The reversal of 11565040 is 4056511.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11565041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 72202 + ... + 72361.

Almost surely, 2^11565040 is an apocalyptic number.

11565040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11565040 is an abundant number, since it is smaller than the sum of its proper divisors (15323864).

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

11565040 is a wasteful number, since it uses less digits than its factorization.

11565040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144576 (or 144570 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 11565040 is about 3400.7410957025. The cubic root of 11565040 is about 226.1425993308.

The spelling of 11565040 in words is "eleven million, five hundred sixty-five thousand, forty".