9937878994 has 4 divisors (see below), whose sum is σ = 14906818494. Its totient is φ = 4968939496.

The previous prime is 9937878991. The next prime is 9937879001. The reversal of 9937878994 is 4998787399.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8942160969 + 995718025 = 94563^2 + 31555^2 .

It is a super-2 number, since 2×9937878994² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9937878991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2484469747 + ... + 2484469750.

Almost surely, 2^9937878994 is an apocalyptic number.

9937878994 is a deficient number, since it is larger than the sum of its proper divisors (4968939500).

9937878994 is a wasteful number, since it uses less digits than its factorization.

9937878994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4968939499.

The product of its digits is 246903552, while the sum is 73.

The square root of 9937878994 is about 99688.9110884455. The cubic root of 9937878994 is about 2149.9642318910.

The spelling of 9937878994 in words is "nine billion, nine hundred thirty-seven million, eight hundred seventy-eight thousand, nine hundred ninety-four".