9940008978 has 12 divisors (see below), whose sum is σ = 21536686158. Its totient is φ = 3313336320.

The previous prime is 9940008977. The next prime is 9940008979. The reversal of 9940008978 is 8798000499.

9940008978 is a `hidden beast` number, since 99 + 400 + 0 + 89 + 78 = 666.

9940008978 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9940008977) and next prime (9940008979).

It can be written as a sum of positive squares in only one way, i.e., 9825369129 + 114639849 = 99123^2 + 10707^2 .

It is not an unprimeable number, because it can be changed into a prime (9940008977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 276111343 + ... + 276111378.

Almost surely, 2^9940008978 is an apocalyptic number.

9940008978 is an abundant number, since it is smaller than the sum of its proper divisors (11596677180).

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

9940008978 is a wasteful number, since it uses less digits than its factorization.

9940008978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552222729 (or 552222726 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 9940008978 is about 99699.5936701850. The cubic root of 9940008978 is about 2150.1178214141.

The spelling of 9940008978 in words is "nine billion, nine hundred forty million, eight thousand, nine hundred seventy-eight".