99999867 has 16 divisors (see below), whose sum is σ = 147922560.
Its totient is φ = 59577600.
The previous prime is 99999847. The next prime is 99999931. The reversal of 99999867 is 76899999.
It is not a de Polignac number, because 99999867 - 28 = 99999611 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 99999798 and 99999807.
It is not an unprimeable number, because it can be changed into a prime (99999827) 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 15 ways as a sum of consecutive naturals, for example, 23734 + ... + 27627.
It is an arithmetic number, because the mean of its divisors is an integer number (9245160).
Almost surely, 299999867 is an apocalyptic number.
99999867 is a deficient number, since it is larger than the sum of its proper divisors (47922693).
99999867 is a wasteful number, since it uses less digits than its factorization.
99999867 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 51434.
The product of its digits is 19840464, while the sum is 66.
The square root of 99999867 is about 9999.9933499978.
The cubic root of 99999867 is about 464.1586775841.
The spelling of 99999867 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred sixty-seven".