11989881438 has 8 divisors (see below), whose sum is σ = 23979762888. Its totient is φ = 3996627144.

The previous prime is 11989881437. The next prime is 11989881443. The reversal of 11989881438 is 83418898911.

It is a happy number.

11989881438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

11989881438 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989881437) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 999156781 + ... + 999156792.

It is an arithmetic number, because the mean of its divisors is an integer number (2997470361).

Almost surely, 2^11989881438 is an apocalyptic number.

11989881438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

11989881438 is a wasteful number, since it uses less digits than its factorization.

11989881438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998313578.

The product of its digits is 3981312, while the sum is 60.

The spelling of 11989881438 in words is "eleven billion, nine hundred eighty-nine million, eight hundred eighty-one thousand, four hundred thirty-eight".