4023209 has 4 divisors (see below), whose sum is σ = 4116816. Its totient is φ = 3929604.

The previous prime is 4023191. The next prime is 4023221. The reversal of 4023209 is 9023204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4023209 - 2¹⁶ = 3957673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4023109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46739 + ... + 46824.

It is an arithmetic number, because the mean of its divisors is an integer number (1029204).

Almost surely, 2^4023209 is an apocalyptic number.

It is an amenable number.

4023209 is a deficient number, since it is larger than the sum of its proper divisors (93607).

4023209 is an equidigital number, since it uses as much as digits as its factorization.

4023209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93606.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 4023209 is about 2005.7938578029. The cubic root of 4023209 is about 159.0465298997.

The spelling of 4023209 in words is "four million, twenty-three thousand, two hundred nine".