11181939840 has 320 divisors, whose sum is σ = 40914470520. Its totient is φ = 2908569600.

The previous prime is 11181939823. The next prime is 11181939911. The reversal of 11181939840 is 4893918111.

It is a happy number.

11181939840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7427681856 + 3754257984 = 86184^2 + 61272^2 .

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2122810 + ... + 2128070.

Almost surely, 2^11181939840 is an apocalyptic number.

11181939840 is a gapful number since it is divisible by the number (10) 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 11181939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20457235260).

11181939840 is an abundant number, since it is smaller than the sum of its proper divisors (29732530680).

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

11181939840 is an equidigital number, since it uses as much as digits as its factorization.

11181939840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5333 (or 5312 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 45.

The spelling of 11181939840 in words is "eleven billion, one hundred eighty-one million, nine hundred thirty-nine thousand, eight hundred forty".