999385 has 4 divisors (see below), whose sum is σ = 1199268. Its totient is φ = 799504.

The previous prime is 999377. The next prime is 999389. The reversal of 999385 is 583999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 741321 + 258064 = 861^2 + 508^2 .

It is a cyclic number.

It is not a de Polignac number, because 999385 - 2³ = 999377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999389) 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, 99934 + ... + 99943.

It is an arithmetic number, because the mean of its divisors is an integer number (299817).

2⁹⁹⁹³⁸⁵ is an apocalyptic number.

It is an amenable number.

999385 is a deficient number, since it is larger than the sum of its proper divisors (199883).

999385 is a wasteful number, since it uses less digits than its factorization.

999385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199882.

The product of its digits is 87480, while the sum is 43.

The square root of 999385 is about 999.6924527073. The cubic root of 999385 is about 99.9794957961.

The spelling of 999385 in words is "nine hundred ninety-nine thousand, three hundred eighty-five".