99389999 has 8 divisors (see below), whose sum is σ = 104533632. Its totient is φ = 94367520.

The previous prime is 99389993. The next prime is 99390019. The reversal of 99389999 is 99998399.

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-99389999 is a prime.

It is a Duffinian number.

99389999 is a modest number, since divided by 9999 gives 9938 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99389993) 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, 28604 + ... + 31889.

It is an arithmetic number, because the mean of its divisors is an integer number (13066704).

Almost surely, 2^99389999 is an apocalyptic number.

99389999 is a deficient number, since it is larger than the sum of its proper divisors (5143633).

99389999 is a wasteful number, since it uses less digits than its factorization.

99389999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60577.

The product of its digits is 12754584, while the sum is 65.

The square root of 99389999 is about 9969.4532949405. The cubic root of 99389999 is about 463.2131665092.

Subtracting 99389999 from its reverse (99998399), we obtain a square (608400 = 780²).

The spelling of 99389999 in words is "ninety-nine million, three hundred eighty-nine thousand, nine hundred ninety-nine".