9938973640 has 16 divisors (see below), whose sum is σ = 22362690780. Its totient is φ = 3975589440.

The previous prime is 9938973637. The next prime is 9938973703. The reversal of 9938973640 is 463798399.

It can be written as a sum of positive squares in 2 ways, for example, as 9836275684 + 102697956 = 99178^2 + 10134^2 .

It is a super-2 number, since 2×9938973640² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124237131 + ... + 124237210.

Almost surely, 2^9938973640 is an apocalyptic number.

It is an amenable number.

9938973640 is an abundant number, since it is smaller than the sum of its proper divisors (12423717140).

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

9938973640 is a wasteful number, since it uses less digits than its factorization.

9938973640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248474352 (or 248474348 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 58.

The square root of 9938973640 is about 99694.4012470109. The cubic root of 9938973640 is about 2150.0431676929.

The spelling of 9938973640 in words is "nine billion, nine hundred thirty-eight million, nine hundred seventy-three thousand, six hundred forty".