999985 has 8 divisors (see below), whose sum is σ = 1371456. Its totient is φ = 685680.

The previous prime is 999983. The next prime is 1000003. The reversal of 999985 is 589999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999985 - 2¹ = 999983 is a prime.

It is a Duffinian number.

999985 is a lucky number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999983) 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, 14251 + ... + 14320.

It is an arithmetic number, because the mean of its divisors is an integer number (171432).

2⁹⁹⁹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

999985 is a deficient number, since it is larger than the sum of its proper divisors (371471).

999985 is a wasteful number, since it uses less digits than its factorization.

999985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28583.

The product of its digits is 262440, while the sum is 49.

The square root of 999985 is about 999.9924999719. The cubic root of 999985 is about 99.9994999975. Note that the first 3 decimals are identical.

The spelling of 999985 in words is "nine hundred ninety-nine thousand, nine hundred eighty-five".