12005999 has 4 divisors (see below), whose sum is σ = 12012936. Its totient is φ = 11999064.

The previous prime is 12005963. The next prime is 12006017. The reversal of 12005999 is 99950021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99950021 = 17 ⋅5879413.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12005999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12005909) 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, 1517 + ... + 5129.

It is an arithmetic number, because the mean of its divisors is an integer number (3003234).

Almost surely, 2^12005999 is an apocalyptic number.

12005999 is a deficient number, since it is larger than the sum of its proper divisors (6937).

12005999 is an equidigital number, since it uses as much as digits as its factorization.

12005999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6936.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 12005999 is about 3464.9673880139. The cubic root of 12005999 is about 228.9809929369.

The spelling of 12005999 in words is "twelve million, five thousand, nine hundred ninety-nine".