9999869 has 8 divisors (see below), whose sum is σ = 10934112.
Its totient is φ = 9069840.
The previous prime is 9999863. The next prime is 9999877. The reversal of 9999869 is 9689999.
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 2k-9999869 is a prime.
It is a super-2 number, since 2×99998692 = 199994760034322, which contains 22 as substring.
It is a Duffinian number.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9999863) 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, 6002 + ... + 7484.
It is an arithmetic number, because the mean of its divisors is an integer number (1366764).
Almost surely, 29999869 is an apocalyptic number.
It is an amenable number.
9999869 is a deficient number, since it is larger than the sum of its proper divisors (934243).
9999869 is a wasteful number, since it uses less digits than its factorization.
9999869 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2107.
The product of its digits is 2834352, while the sum is 59.
The square root of 9999869 is about 3162.2569471819.
The cubic root of 9999869 is about 215.4425282293.
The spelling of 9999869 in words is "nine million, nine hundred ninety-nine thousand, eight hundred sixty-nine".