999873 has 24 divisors (see below), whose sum is σ = 1684800. Its totient is φ = 559584.

The previous prime is 999863. The next prime is 999883. The reversal of 999873 is 378999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (999863) and next prime (999883).

It is not a de Polignac number, because 999873 - 2⁶ = 999809 is a prime.

It is a super-2 number, since 2×999873² = 1999492032258, which contains 22 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3583 + ... + 3851.

It is an arithmetic number, because the mean of its divisors is an integer number (70200).

2⁹⁹⁹⁸⁷³ is an apocalyptic number.

It is an amenable number.

999873 is a deficient number, since it is larger than the sum of its proper divisors (684927).

999873 is a wasteful number, since it uses less digits than its factorization.

999873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 338 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 999873 is about 999.9364979837. The cubic root of 999873 is about 99.9957664874.

The spelling of 999873 in words is "nine hundred ninety-nine thousand, eight hundred seventy-three".