9978924418 has 32 divisors (see below), whose sum is σ = 16438172400. Its totient is φ = 4522205184.

The previous prime is 9978924407. The next prime is 9978924419. The reversal of 9978924418 is 8144298799.

It can be written as a sum of positive squares in 8 ways, for example, as 6526539369 + 3452385049 = 80787^2 + 58757^2 .

It is not an unprimeable number, because it can be changed into a prime (9978924419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370546 + ... + 396562.

Almost surely, 2^9978924418 is an apocalyptic number.

9978924418 is a deficient number, since it is larger than the sum of its proper divisors (6459247982).

9978924418 is a wasteful number, since it uses less digits than its factorization.

9978924418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26454.

The product of its digits is 10450944, while the sum is 61.

The square root of 9978924418 is about 99894.5665088948. The cubic root of 9978924418 is about 2152.9200933337.

The spelling of 9978924418 in words is "nine billion, nine hundred seventy-eight million, nine hundred twenty-four thousand, four hundred eighteen".