1604224 has 32 divisors (see below), whose sum is σ = 3255840. Its totient is φ = 787200.

The previous prime is 1604191. The next prime is 1604231. The reversal of 1604224 is 4224061.

It is a tau number, because it is divible by the number of its divisors (32).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10549 + ... + 10699.

It is an arithmetic number, because the mean of its divisors is an integer number (101745).

2^1604224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1604224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627920).

1604224 is an abundant number, since it is smaller than the sum of its proper divisors (1651616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1604224 is an equidigital number, since it uses as much as digits as its factorization.

1604224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1604224 is about 1266.5796461336. The cubic root of 1604224 is about 117.0635445111.

Adding to 1604224 its reverse (4224061), we get a palindrome (5828285).

The spelling of 1604224 in words is "one million, six hundred four thousand, two hundred twenty-four".