9887979 has 8 divisors (see below), whose sum is σ = 13490752. Its totient is φ = 6438600.

The previous prime is 9887971. The next prime is 9887993. The reversal of 9887979 is 9797889.

It is a happy number.

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

It is not a de Polignac number, because 9887979 - 2³ = 9887971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9887971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38197 + ... + 38454.

It is an arithmetic number, because the mean of its divisors is an integer number (1686344).

Almost surely, 2^9887979 is an apocalyptic number.

9887979 is a deficient number, since it is larger than the sum of its proper divisors (3602773).

9887979 is a wasteful number, since it uses less digits than its factorization.

9887979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76697.

The product of its digits is 2286144, while the sum is 57.

The square root of 9887979 is about 3144.5157019802. The cubic root of 9887979 is about 214.6359731437.

The spelling of 9887979 in words is "nine million, eight hundred eighty-seven thousand, nine hundred seventy-nine".