9979898 has 4 divisors (see below), whose sum is σ = 14969850. Its totient is φ = 4989948.

The previous prime is 9979897. The next prime is 9979927. The reversal of 9979898 is 8989799.

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., 9840769 + 139129 = 3137^2 + 373^2 .

It is not an unprimeable number, because it can be changed into a prime (9979897) 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 as a sum of consecutive naturals, namely, 2494973 + ... + 2494976.

Almost surely, 2^9979898 is an apocalyptic number.

9979898 is a deficient number, since it is larger than the sum of its proper divisors (4989952).

9979898 is a wasteful number, since it uses less digits than its factorization.

9979898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4989951.

The product of its digits is 2939328, while the sum is 59.

The square root of 9979898 is about 3159.0976559771. The cubic root of 9979898 is about 215.2990106761.

Subtracting from 9979898 its reverse (8989799), we obtain a palindrome (990099).

It can be divided in two parts, 99 and 79898, that added together give a palindrome (79997).

The spelling of 9979898 in words is "nine million, nine hundred seventy-nine thousand, eight hundred ninety-eight".