2003999 has 2 divisors, whose sum is σ = 2004000. Its totient is φ = 2003998.

The previous prime is 2003971. The next prime is 2004001. The reversal of 2003999 is 9993002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2003999 is a prime.

It is a Sophie Germain prime.

Together with 2004001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2003959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001999 + 1002000.

It is an arithmetic number, because the mean of its divisors is an integer number (1002000).

2^2003999 is an apocalyptic number.

2003999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2003999 is an equidigital number, since it uses as much as digits as its factorization.

2003999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 2003999 is about 1415.6267163345. The cubic root of 2003999 is about 126.0760228211.

The spelling of 2003999 in words is "two million, three thousand, nine hundred ninety-nine".