99999869 has 8 divisors (see below), whose sum is σ = 105601440.
Its totient is φ = 94432176.
The previous prime is 99999847. The next prime is 99999931. The reversal of 99999869 is 96899999.
99999869 = T214 + T215 + ... +
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 99999869 - 224 = 83222653 is a prime.
It is a super-2 number, since 2×999998692 = 19999947600034322, which contains 22 as substring.
It is a Duffinian number.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 99999799 and 99999808.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (99999839) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2279 + ... + 14324.
It is an arithmetic number, because the mean of its divisors is an integer number (13200180).
Almost surely, 299999869 is an apocalyptic number.
It is an amenable number.
99999869 is a deficient number, since it is larger than the sum of its proper divisors (5601571).
99999869 is a wasteful number, since it uses less digits than its factorization.
99999869 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 16939.
The product of its digits is 25509168, while the sum is 68.
The square root of 99999869 is about 9999.9934499979.
The cubic root of 99999869 is about 464.1586806785.
The spelling of 99999869 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred sixty-nine".