99817989 has 8 divisors (see below), whose sum is σ = 135922560. Its totient is φ = 65129376.

The previous prime is 99817987. The next prime is 99818009. The reversal of 99817989 is 98971899.

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

It is not a de Polignac number, because 99817989 - 2¹ = 99817987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99817987) 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, 353824 + ... + 354105.

It is an arithmetic number, because the mean of its divisors is an integer number (16990320).

Almost surely, 2^99817989 is an apocalyptic number.

It is an amenable number.

99817989 is a deficient number, since it is larger than the sum of its proper divisors (36104571).

99817989 is a wasteful number, since it uses less digits than its factorization.

99817989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707979.

The product of its digits is 2939328, while the sum is 60.

The square root of 99817989 is about 9990.8953052267. The cubic root of 99817989 is about 463.8771055948.

The spelling of 99817989 in words is "ninety-nine million, eight hundred seventeen thousand, nine hundred eighty-nine".