999289 has 4 divisors (see below), whose sum is σ = 1002640. Its totient is φ = 995940.

The previous prime is 999287. The next prime is 999307. The reversal of 999289 is 982999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982999 = 59 ⋅16661.

It is a cyclic number.

It is not a de Polignac number, because 999289 - 2¹ = 999287 is a prime.

It is a Duffinian number.

999289 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (999287) 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, 1179 + ... + 1840.

It is an arithmetic number, because the mean of its divisors is an integer number (250660).

2⁹⁹⁹²⁸⁹ is an apocalyptic number.

It is an amenable number.

999289 is a deficient number, since it is larger than the sum of its proper divisors (3351).

999289 is a wasteful number, since it uses less digits than its factorization.

999289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3350.

The product of its digits is 104976, while the sum is 46.

The square root of 999289 is about 999.6444367874. The cubic root of 999289 is about 99.9762943809.

Subtracting from 999289 its reverse (982999), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 999289 in words is "nine hundred ninety-nine thousand, two hundred eighty-nine".