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99985 = 519997
BaseRepresentation
bin11000011010010001
312002011011
4120122101
511144420
62050521
7564334
oct303221
9162134
1099985
1169136
1249a41
1336682
142861b
151e95a
hex18691

99985 has 4 divisors (see below), whose sum is σ = 119988. Its totient is φ = 79984.

The previous prime is 99971. The next prime is 99989. The reversal of 99985 is 58999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58999 = 411439.

It can be written as a sum of positive squares in 2 ways, for example, as 63504 + 36481 = 252^2 + 191^2 .

It is a cyclic number.

It is not a de Polignac number, because 99985 - 215 = 67217 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9994 + ... + 10003.

It is an arithmetic number, because the mean of its divisors is an integer number (29997).

299985 is an apocalyptic number.

It is an amenable number.

99985 is a deficient number, since it is larger than the sum of its proper divisors (20003).

99985 is a wasteful number, since it uses less digits than its factorization.

99985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20002.

The product of its digits is 29160, while the sum is 40.

The square root of 99985 is about 316.2040480449. The cubic root of 99985 is about 46.4135674257.

The spelling of 99985 in words is "ninety-nine thousand, nine hundred eighty-five".

Divisors: 1 5 19997 99985