7939943440 has 160 divisors (see below), whose sum is σ = 22829788800. Its totient is φ = 2524815360.

The previous prime is 7939943423. The next prime is 7939943443. The reversal of 7939943440 is 443499397.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (7939943443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199096 + ... + 235624.

It is an arithmetic number, because the mean of its divisors is an integer number (142686180).

Almost surely, 2^7939943440 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 7939943440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11414894400).

7939943440 is an abundant number, since it is smaller than the sum of its proper divisors (14889845360).

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

7939943440 is a wasteful number, since it uses less digits than its factorization.

7939943440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36585 (or 36579 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 52.

The square root of 7939943440 is about 89106.3602668182. The cubic root of 7939943440 is about 1994.9827105953.

The spelling of 7939943440 in words is "seven billion, nine hundred thirty-nine million, nine hundred forty-three thousand, four hundred forty".