1604225 has 24 divisors (see below), whose sum is σ = 2321280. Its totient is φ = 1077120.

The previous prime is 1604191. The next prime is 1604231. The reversal of 1604225 is 5224061.

It is a happy number.

It is not a de Polignac number, because 1604225 - 2¹⁴ = 1587841 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1604197 and 1604206.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15524 + ... + 15626.

It is an arithmetic number, because the mean of its divisors is an integer number (96720).

2^1604225 is an apocalyptic number.

It is an amenable number.

1604225 is a deficient number, since it is larger than the sum of its proper divisors (717055).

1604225 is a wasteful number, since it uses less digits than its factorization.

1604225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1604225 is about 1266.5800408975. The cubic root of 1604225 is about 117.0635688352.

Adding to 1604225 its reverse (5224061), we get a palindrome (6828286).

The spelling of 1604225 in words is "one million, six hundred four thousand, two hundred twenty-five".