11881818 has 24 divisors (see below), whose sum is σ = 27724788. Its totient is φ = 3655872.

The previous prime is 11881811. The next prime is 11881829. The reversal of 11881818 is 81818811.

It can be written as a sum of positive squares in 2 ways, for example, as 11881809 + 9 = 3447^2 + 3^2 .

11881818 is a modest number, since divided by 1818 gives 1188 as remainder.

It is not an unprimeable number, because it can be changed into a prime (11881811) 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 11 ways as a sum of consecutive naturals, for example, 25155 + ... + 25622.

Almost surely, 2^11881818 is an apocalyptic number.

11881818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11881818 is an abundant number, since it is smaller than the sum of its proper divisors (15842970).

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

11881818 is a wasteful number, since it uses less digits than its factorization.

11881818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50798 (or 50795 counting only the distinct ones).

The product of its digits is 4096, while the sum is 36.

The square root of 11881818 is about 3447.0013054828. The cubic root of 11881818 is about 228.1887863914.

The spelling of 11881818 in words is "eleven million, eight hundred eighty-one thousand, eight hundred eighteen".