9984378977 has 8 divisors (see below), whose sum is σ = 10175829120. Its totient is φ = 9793042480.

The previous prime is 9984378973. The next prime is 9984378979. The reversal of 9984378977 is 7798734899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9984378977 - 2² = 9984378973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9984378977.

It is not an unprimeable number, because it can be changed into a prime (9984378973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160952 + ... + 214182.

It is an arithmetic number, because the mean of its divisors is an integer number (1271978640).

Almost surely, 2^9984378977 is an apocalyptic number.

It is an amenable number.

9984378977 is a deficient number, since it is larger than the sum of its proper divisors (191450143).

9984378977 is a wasteful number, since it uses less digits than its factorization.

9984378977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56823.

The product of its digits is 192036096, while the sum is 71.

The square root of 9984378977 is about 99921.8643591081. The cubic root of 9984378977 is about 2153.3122895992.

The spelling of 9984378977 in words is "nine billion, nine hundred eighty-four million, three hundred seventy-eight thousand, nine hundred seventy-seven".