999165 has 16 divisors (see below), whose sum is σ = 1627200. Its totient is φ = 523392.

The previous prime is 999149. The next prime is 999169. The reversal of 999165 is 561999.

It is not a de Polignac number, because 999165 - 2⁴ = 999149 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999165.

It is not an unprimeable number, because it can be changed into a prime (999169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321 + ... + 1449.

It is an arithmetic number, because the mean of its divisors is an integer number (101700).

2⁹⁹⁹¹⁶⁵ is an apocalyptic number.

It is an amenable number.

999165 is a deficient number, since it is larger than the sum of its proper divisors (628035).

999165 is a wasteful number, since it uses less digits than its factorization.

999165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196.

The product of its digits is 21870, while the sum is 39.

The square root of 999165 is about 999.5824128105. The cubic root of 999165 is about 99.9721589161.

The spelling of 999165 in words is "nine hundred ninety-nine thousand, one hundred sixty-five".