9879395978 has 4 divisors (see below), whose sum is σ = 14819093970. Its totient is φ = 4939697988.

The previous prime is 9879395959. The next prime is 9879396017. The reversal of 9879395978 is 8795939789.

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., 9119677009 + 759718969 = 95497^2 + 27563^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2469848993 + ... + 2469848996.

Almost surely, 2^9879395978 is an apocalyptic number.

9879395978 is a deficient number, since it is larger than the sum of its proper divisors (4939697992).

9879395978 is a wasteful number, since it uses less digits than its factorization.

9879395978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939697991.

The product of its digits is 308629440, while the sum is 74.

The square root of 9879395978 is about 99395.1506764792. The cubic root of 9879395978 is about 2145.7385197049.

The spelling of 9879395978 in words is "nine billion, eight hundred seventy-nine million, three hundred ninety-five thousand, nine hundred seventy-eight".