11947889814 has 80 divisors (see below), whose sum is σ = 29344620480. Its totient is φ = 3233941200.

The previous prime is 11947889797. The next prime is 11947889843. The reversal of 11947889814 is 41898874911.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 251889 + ... + 295539.

It is an arithmetic number, because the mean of its divisors is an integer number (366807756).

Almost surely, 2^11947889814 is an apocalyptic number.

11947889814 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11947889814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14672310240).

11947889814 is an abundant number, since it is smaller than the sum of its proper divisors (17396730666).

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

11947889814 is an equidigital number, since it uses as much as digits as its factorization.

11947889814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43703 (or 43682 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 60.

The spelling of 11947889814 in words is "eleven billion, nine hundred forty-seven million, eight hundred eighty-nine thousand, eight hundred fourteen".