11805191388 has 72 divisors (see below), whose sum is σ = 30181722480. Its totient is φ = 3890211840.

The previous prime is 11805191369. The next prime is 11805191389. The reversal of 11805191388 is 88319150811.

11805191388 is a `hidden beast` number, since 1 + 1 + 80 + 5 + 191 + 388 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11805191389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5512798 + ... + 5514938.

It is an arithmetic number, because the mean of its divisors is an integer number (419190590).

Almost surely, 2^11805191388 is an apocalyptic number.

11805191388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11805191388 is an abundant number, since it is smaller than the sum of its proper divisors (18376531092).

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

11805191388 is a wasteful number, since it uses less digits than its factorization.

11805191388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3827 (or 3822 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 45.

The spelling of 11805191388 in words is "eleven billion, eight hundred five million, one hundred ninety-one thousand, three hundred eighty-eight".