9989818 has 4 divisors (see below), whose sum is σ = 14984730. Its totient is φ = 4994908.

The previous prime is 9989813. The next prime is 9989827. The reversal of 9989818 is 8189899.

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., 6796449 + 3193369 = 2607^2 + 1787^2 .

It is not an unprimeable number, because it can be changed into a prime (9989813) 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, 2497453 + ... + 2497456.

Almost surely, 2^9989818 is an apocalyptic number.

9989818 is a deficient number, since it is larger than the sum of its proper divisors (4994912).

9989818 is a wasteful number, since it uses less digits than its factorization.

9989818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4994911.

The product of its digits is 373248, while the sum is 52.

The square root of 9989818 is about 3160.6673345988. The cubic root of 9989818 is about 215.3703226583.

It can be divided in two parts, 998 and 9818, that added together give a square (10816 = 104²).

The spelling of 9989818 in words is "nine million, nine hundred eighty-nine thousand, eight hundred eighteen".