98009999 has 8 divisors (see below), whose sum is σ = 103376880. Its totient is φ = 92664000.

The previous prime is 98009963. The next prime is 98010001. The reversal of 98009999 is 99990089.

It is a happy number.

It is a Cunningham number, because it is equal to 9900²-1.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98009999 is a prime.

It is a Duffinian number.

98009999 is a modest number, since divided by 9999 gives 9800 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 98009999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98009099) 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, 4949 + ... + 14849.

It is an arithmetic number, because the mean of its divisors is an integer number (12922110).

Almost surely, 2^98009999 is an apocalyptic number.

98009999 is a deficient number, since it is larger than the sum of its proper divisors (5366881).

98009999 is a wasteful number, since it uses less digits than its factorization.

98009999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10441.

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 98009999 is about 9899.9999494949. Note that the first 4 decimals coincide. The cubic root of 98009999 is about 461.0593088605.

The spelling of 98009999 in words is "ninety-eight million, nine thousand, nine hundred ninety-nine".