425409 has 4 divisors (see below), whose sum is σ = 567216. Its totient is φ = 283604.

The previous prime is 425393. The next prime is 425417. The reversal of 425409 is 904524.

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 425409 - 2⁴ = 425393 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (425419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70899 + ... + 70904.

It is an arithmetic number, because the mean of its divisors is an integer number (141804).

2⁴²⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

425409 is a deficient number, since it is larger than the sum of its proper divisors (141807).

425409 is a wasteful number, since it uses less digits than its factorization.

425409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141806.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 425409 is about 652.2338537672. The cubic root of 425409 is about 75.2088401596.

The spelling of 425409 in words is "four hundred twenty-five thousand, four hundred nine".