8117839723940 has 48 divisors (see below), whose sum is σ = 17729828659200. Its totient is φ = 3119383343232.

The previous prime is 8117839723919. The next prime is 8117839723949. The reversal of 8117839723940 is 493279387118.

It is not an unprimeable number, because it can be changed into a prime (8117839723949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69372260 + ... + 69489179.

It is an arithmetic number, because the mean of its divisors is an integer number (369371430400).

Almost surely, 2^{8117839723940} is an apocalyptic number.

It is an amenable number.

8117839723940 is an abundant number, since it is smaller than the sum of its proper divisors (9611988935260).

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

8117839723940 is a wasteful number, since it uses less digits than its factorization.

8117839723940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138861564 (or 138861562 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 62.

The spelling of 8117839723940 in words is "eight trillion, one hundred seventeen billion, eight hundred thirty-nine million, seven hundred twenty-three thousand, nine hundred forty".