2143999 has 24 divisors (see below), whose sum is σ = 2681280. Its totient is φ = 1700160.

The previous prime is 2143993. The next prime is 2144011. The reversal of 2143999 is 9993412.

It is not a de Polignac number, because 2143999 - 2⁹ = 2143487 is a prime.

It is a Duffinian number.

2143999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45594 + ... + 45640.

It is an arithmetic number, because the mean of its divisors is an integer number (111720).

2^2143999 is an apocalyptic number.

2143999 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2143999 is a deficient number, since it is larger than the sum of its proper divisors (537281).

2143999 is a wasteful number, since it uses less digits than its factorization.

2143999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 100 counting only the distinct ones).

The product of its digits is 17496, while the sum is 37.

The square root of 2143999 is about 1464.2400759438. The cubic root of 2143999 is about 128.9460944977.

The spelling of 2143999 in words is "two million, one hundred forty-three thousand, nine hundred ninety-nine".