825609 has 8 divisors (see below), whose sum is σ = 1108800. Its totient is φ = 546416.

The previous prime is 825593. The next prime is 825611. The reversal of 825609 is 906528.

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 825609 - 2⁴ = 825593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (825679) 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, 477 + ... + 1370.

It is an arithmetic number, because the mean of its divisors is an integer number (138600).

2⁸²⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

825609 is a deficient number, since it is larger than the sum of its proper divisors (283191).

825609 is a wasteful number, since it uses less digits than its factorization.

825609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 825609 is about 908.6302878509. The cubic root of 825609 is about 93.8119448390.

The spelling of 825609 in words is "eight hundred twenty-five thousand, six hundred nine".