9945207940 has 12 divisors (see below), whose sum is σ = 20884936716. Its totient is φ = 3978083168.

The previous prime is 9945207803. The next prime is 9945207941. The reversal of 9945207940 is 497025499.

It can be written as a sum of positive squares in 2 ways, for example, as 7217861764 + 2727346176 = 84958^2 + 52224^2 .

It is not an unprimeable number, because it can be changed into a prime (9945207941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248630179 + ... + 248630218.

It is an arithmetic number, because the mean of its divisors is an integer number (1740411393).

Almost surely, 2^9945207940 is an apocalyptic number.

It is an amenable number.

9945207940 is an abundant number, since it is smaller than the sum of its proper divisors (10939728776).

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

9945207940 is a wasteful number, since it uses less digits than its factorization.

9945207940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497260406 (or 497260404 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 9945207940 is about 99725.6633971417. The cubic root of 9945207940 is about 2150.4926176056.

The spelling of 9945207940 in words is "nine billion, nine hundred forty-five million, two hundred seven thousand, nine hundred forty".