5999 has 4 divisors (see below), whose sum is σ = 6864. Its totient is φ = 5136.

The previous prime is 5987. The next prime is 6007. The reversal of 5999 is 9995.

5999 = T₂₂ + T₂₃ + ... + T₃₅.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9995 = 5 ⋅1999.

It is a cyclic number.

It is not a de Polignac number, because 5999 - 2⁸ = 5743 is a prime.

It is a Duffinian number.

5999 is a modest number, since divided by 99 gives 59 as remainder.

It is a plaindrome in base 8, base 10 and base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5939) 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, 422 + ... + 435.

It is an arithmetic number, because the mean of its divisors is an integer number (1716).

2⁵⁹⁹⁹ is an apocalyptic number.

5999 is a deficient number, since it is larger than the sum of its proper divisors (865).

5999 is an equidigital number, since it uses as much as digits as its factorization.

5999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864.

The product of its digits is 3645, while the sum is 32.

The square root of 5999 is about 77.4532116829. The cubic root of 5999 is about 18.1701963608.

The spelling of 5999 in words is "five thousand, nine hundred ninety-nine".