9643439854040 has 128 divisors (see below), whose sum is σ = 22878766872000. Its totient is φ = 3653022793728.

The previous prime is 9643439854033. The next prime is 9643439854073. The reversal of 9643439854040 is 404589343469.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17842496 + ... + 18375024.

Almost surely, 2^{9643439854040} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9643439854040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11439383436000).

9643439854040 is an abundant number, since it is smaller than the sum of its proper divisors (13235327017960).

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

9643439854040 is a wasteful number, since it uses less digits than its factorization.

9643439854040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532869 (or 532865 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 59.

The spelling of 9643439854040 in words is "nine trillion, six hundred forty-three billion, four hundred thirty-nine million, eight hundred fifty-four thousand, forty".