425209 has 8 divisors (see below), whose sum is σ = 443520. Its totient is φ = 407376.

The previous prime is 425207. The next prime is 425233. The reversal of 425209 is 902524.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 425209 - 2¹ = 425207 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 425209.

It is not an unprimeable number, because it can be changed into a prime (425207) 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 7 ways as a sum of consecutive naturals, for example, 3847 + ... + 3955.

It is an arithmetic number, because the mean of its divisors is an integer number (55440).

2⁴²⁵²⁰⁹ is an apocalyptic number.

It is an amenable number.

425209 is a deficient number, since it is larger than the sum of its proper divisors (18311).

425209 is a wasteful number, since it uses less digits than its factorization.

425209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 425209 is about 652.0805165008. The cubic root of 425209 is about 75.1970521894.

The spelling of 425209 in words is "four hundred twenty-five thousand, two hundred nine".