9939457872 has 30 divisors (see below), whose sum is σ = 27816677642. Its totient is φ = 3313152576.

The previous prime is 9939457867. The next prime is 9939457903. The reversal of 9939457872 is 2787549399.

It can be written as a sum of positive squares in only one way, i.e., 5050092096 + 4889365776 = 71064^2 + 69924^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34511863 + ... + 34512150.

Almost surely, 2^9939457872 is an apocalyptic number.

It is an amenable number.

9939457872 is an abundant number, since it is smaller than the sum of its proper divisors (17877219770).

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

9939457872 is a wasteful number, since it uses less digits than its factorization.

9939457872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69024027 (or 69024018 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 63.

The square root of 9939457872 is about 99696.8297991466. The cubic root of 9939457872 is about 2150.0780842021.

The spelling of 9939457872 in words is "nine billion, nine hundred thirty-nine million, four hundred fifty-seven thousand, eight hundred seventy-two".