999825 has 12 divisors (see below), whose sum is σ = 1653168. Its totient is φ = 533200.

The previous prime is 999809. The next prime is 999853. The reversal of 999825 is 528999.

It is not a de Polignac number, because 999825 - 2⁴ = 999809 is a prime.

It is a Curzon number.

999825 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6591 + ... + 6740.

It is an arithmetic number, because the mean of its divisors is an integer number (137764).

2⁹⁹⁹⁸²⁵ is an apocalyptic number.

It is an amenable number.

999825 is a deficient number, since it is larger than the sum of its proper divisors (653343).

999825 is a wasteful number, since it uses less digits than its factorization.

999825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13344 (or 13339 counting only the distinct ones).

The product of its digits is 58320, while the sum is 42.

The square root of 999825 is about 999.9124961715. The cubic root of 999825 is about 99.9941663264.

The spelling of 999825 in words is "nine hundred ninety-nine thousand, eight hundred twenty-five".