4140209 has 4 divisors (see below), whose sum is σ = 4150080. Its totient is φ = 4130340.

The previous prime is 4140173. The next prime is 4140211. The reversal of 4140209 is 9020414.

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 4140209 - 2²⁰ = 3091633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4140259) 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, 4277 + ... + 5154.

It is an arithmetic number, because the mean of its divisors is an integer number (1037520).

Almost surely, 2^4140209 is an apocalyptic number.

It is an amenable number.

4140209 is a deficient number, since it is larger than the sum of its proper divisors (9871).

4140209 is an equidigital number, since it uses as much as digits as its factorization.

4140209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9870.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4140209 is about 2034.7503532375. The cubic root of 4140209 is about 160.5735793558.

The spelling of 4140209 in words is "four million, one hundred forty thousand, two hundred nine".