11009540 has 24 divisors (see below), whose sum is σ = 24480792. Its totient is φ = 4144640.

The previous prime is 11009539. The next prime is 11009543. The reversal of 11009540 is 4590011.

It can be written as a sum of positive squares in 4 ways, for example, as 2795584 + 8213956 = 1672^2 + 2866^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (11009543) 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 7 ways as a sum of consecutive naturals, for example, 15851 + ... + 16530.

It is an arithmetic number, because the mean of its divisors is an integer number (1020033).

Almost surely, 2^11009540 is an apocalyptic number.

11009540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11009540 is an abundant number, since it is smaller than the sum of its proper divisors (13471252).

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

11009540 is a wasteful number, since it uses less digits than its factorization.

11009540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32407 (or 32405 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 11009540 is about 3318.0626877743. The cubic root of 11009540 is about 222.4622837219.

Adding to 11009540 its reverse (4590011), we get a palindrome (15599551).

The spelling of 11009540 in words is "eleven million, nine thousand, five hundred forty".