11155880 has 32 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 4430400.

The previous prime is 11155867. The next prime is 11155889. The reversal of 11155880 is 8855111.

11155880 is nontrivially palindromic in base 3.

It is not an unprimeable number, because it can be changed into a prime (11155889) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5117 + ... + 6963.

It is an arithmetic number, because the mean of its divisors is an integer number (790020).

Almost surely, 2^11155880 is an apocalyptic number.

11155880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11155880 is an abundant number, since it is smaller than the sum of its proper divisors (14124760).

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

11155880 is a wasteful number, since it uses less digits than its factorization.

11155880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009 (or 2005 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 29.

The square root of 11155880 is about 3340.0419159046. The cubic root of 11155880 is about 223.4436127723.

The spelling of 11155880 in words is "eleven million, one hundred fifty-five thousand, eight hundred eighty".