11891423808 has 224 divisors, whose sum is σ = 38624256000. Its totient is φ = 3557399040.

The previous prime is 11891423783. The next prime is 11891423833. The reversal of 11891423808 is 80832419811.

It is an interprime number because it is at equal distance from previous prime (11891423783) and next prime (11891423833).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1497673 + ... + 1505591.

Almost surely, 2^11891423808 is an apocalyptic number.

11891423808 is a gapful number since it is divisible by the number (18) 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 11891423808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19312128000).

11891423808 is an abundant number, since it is smaller than the sum of its proper divisors (26732832192).

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

11891423808 is a wasteful number, since it uses less digits than its factorization.

11891423808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8030 (or 8014 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 11891423808 in words is "eleven billion, eight hundred ninety-one million, four hundred twenty-three thousand, eight hundred eight".