99887 has 4 divisors (see below), whose sum is σ = 101640. Its totient is φ = 98136.
The previous prime is 99881. The next prime is 99901. The reversal of 99887 is 78899.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78899 = 257 ⋅307.
It is a cyclic number.
It is not a de Polignac number, because 99887 - 24 = 99871 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (99881) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788 + ... + 905.
It is an arithmetic number, because the mean of its divisors is an integer number (25410).
299887 is an apocalyptic number.
99887 is a deficient number, since it is larger than the sum of its proper divisors (1753).
99887 is a wasteful number, since it uses less digits than its factorization.
99887 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1752.
The product of its digits is 36288, while the sum is 41.
The square root of 99887 is about 316.0490468266. The cubic root of 99887 is about 46.3983984287.
The spelling of 99887 in words is "ninety-nine thousand, eight hundred eighty-seven".
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