424209 has 4 divisors (see below), whose sum is σ = 565616. Its totient is φ = 282804.

The previous prime is 424199. The next prime is 424223. The reversal of 424209 is 902424.

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 not a de Polignac number, because 424209 - 2⁹ = 423697 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (424709) 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, 70699 + ... + 70704.

It is an arithmetic number, because the mean of its divisors is an integer number (141404).

2⁴²⁴²⁰⁹ is an apocalyptic number.

It is an amenable number.

424209 is a deficient number, since it is larger than the sum of its proper divisors (141407).

424209 is a wasteful number, since it uses less digits than its factorization.

424209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141406.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 424209 is about 651.3132886714. The cubic root of 424209 is about 75.1380568260.

The spelling of 424209 in words is "four hundred twenty-four thousand, two hundred nine".