4243999 has 4 divisors (see below), whose sum is σ = 4493664. Its totient is φ = 3994336.

The previous prime is 4243997. The next prime is 4244003. The reversal of 4243999 is 9993424.

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 4243999 - 2¹ = 4243997 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

4243999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4243991) 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, 124807 + ... + 124840.

It is an arithmetic number, because the mean of its divisors is an integer number (1123416).

Almost surely, 2^4243999 is an apocalyptic number.

4243999 is a deficient number, since it is larger than the sum of its proper divisors (249665).

4243999 is a wasteful number, since it uses less digits than its factorization.

4243999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249664.

The product of its digits is 69984, while the sum is 40.

The square root of 4243999 is about 2060.0968423839. The cubic root of 4243999 is about 161.9043152882.

The spelling of 4243999 in words is "four million, two hundred forty-three thousand, nine hundred ninety-nine".