17999 has 4 divisors (see below), whose sum is σ = 18480. Its totient is φ = 17520.

The previous prime is 17989. The next prime is 18013. The reversal of 17999 is 99971.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 17999 - 2¹² = 13903 is a prime.

It is a Duffinian number.

17999 is a modest number, since divided by 999 gives 17 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17909) 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, 179 + ... + 260.

It is an arithmetic number, because the mean of its divisors is an integer number (4620).

2¹⁷⁹⁹⁹ is an apocalyptic number.

17999 is a deficient number, since it is larger than the sum of its proper divisors (481).

17999 is an equidigital number, since it uses as much as digits as its factorization.

17999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480.

The product of its digits is 5103, while the sum is 35.

The square root of 17999 is about 134.1603518183. The cubic root of 17999 is about 26.2069286106.

It can be divided in two parts, 1 and 7999, that added together give a cube (8000 = 20³).

The spelling of 17999 in words is "seventeen thousand, nine hundred ninety-nine".