4005999 has 12 divisors (see below), whose sum is σ = 6127056. Its totient is φ = 2513472.

The previous prime is 4005983. The next prime is 4006001. The reversal of 4005999 is 9995004.

It is not a de Polignac number, because 4005999 - 2⁴ = 4005983 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4005959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12939 + ... + 13244.

It is an arithmetic number, because the mean of its divisors is an integer number (510588).

Almost surely, 2^4005999 is an apocalyptic number.

4005999 is a deficient number, since it is larger than the sum of its proper divisors (2121057).

4005999 is a wasteful number, since it uses less digits than its factorization.

4005999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26206 (or 26203 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 4005999 is about 2001.4991881088. The cubic root of 4005999 is about 158.8194223823.

The spelling of 4005999 in words is "four million, five thousand, nine hundred ninety-nine".