425809 has 8 divisors (see below), whose sum is σ = 455840. Its totient is φ = 396576.

The previous prime is 425801. The next prime is 425813. The reversal of 425809 is 908524.

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 425809 - 2³ = 425801 is a prime.

It is a Duffinian number.

425809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (425801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1234 + ... + 1540.

It is an arithmetic number, because the mean of its divisors is an integer number (56980).

2⁴²⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

425809 is a deficient number, since it is larger than the sum of its proper divisors (30031).

425809 is a wasteful number, since it uses less digits than its factorization.

425809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 425809 is about 652.5404202040. The cubic root of 425809 is about 75.2324050208.

The spelling of 425809 in words is "four hundred twenty-five thousand, eight hundred nine".