999305 has 16 divisors (see below), whose sum is σ = 1289280. Its totient is φ = 741312.

The previous prime is 999287. The next prime is 999307. The reversal of 999305 is 503999.

It is a cyclic number.

It is not a de Polignac number, because 999305 - 2⁸ = 999049 is a prime.

It is a super-2 number, since 2×999305² = 1997220966050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6287 + ... + 6443.

It is an arithmetic number, because the mean of its divisors is an integer number (80580).

2⁹⁹⁹³⁰⁵ is an apocalyptic number.

999305 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

999305 is a deficient number, since it is larger than the sum of its proper divisors (289975).

999305 is a wasteful number, since it uses less digits than its factorization.

999305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248.

The product of its (nonzero) digits is 10935, while the sum is 35.

The square root of 999305 is about 999.6524396009. The cubic root of 999305 is about 99.9768279643.

The spelling of 999305 in words is "nine hundred ninety-nine thousand, three hundred five".