4021999 has 4 divisors (see below), whose sum is σ = 4067280. Its totient is φ = 3976720.

The previous prime is 4021973. The next prime is 4022003. The reversal of 4021999 is 9991204.

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 4021999 - 2⁵ = 4021967 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22507 + ... + 22684.

It is an arithmetic number, because the mean of its divisors is an integer number (1016820).

Almost surely, 2^4021999 is an apocalyptic number.

4021999 is a deficient number, since it is larger than the sum of its proper divisors (45281).

4021999 is an equidigital number, since it uses as much as digits as its factorization.

4021999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45280.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 4021999 is about 2005.4922089103. The cubic root of 4021999 is about 159.0305836241.

It can be divided in two parts, 402 and 1999, that added together give a 4-th power (2401 = 7⁴).

The spelling of 4021999 in words is "four million, twenty-one thousand, nine hundred ninety-nine".