1205604 has 45 divisors (see below), whose sum is σ = 3204201. Its totient is φ = 395280.

The previous prime is 1205563. The next prime is 1205609. The reversal of 1205604 is 4065021.

It is a happy number.

The square root of 1205604 is 1098.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 39204 + 1166400 = 198^2 + 1080^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1205609) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 19734 + ... + 19794.

2^1205604 is an apocalyptic number.

1205604 is the 1098-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1205604

1205604 is an abundant number, since it is smaller than the sum of its proper divisors (1998597).

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

1205604 is an equidigital number, since it uses as much as digits as its factorization.

1205604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 66 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The cubic root of 1205604 is about 106.4310205969.

The spelling of 1205604 in words is "one million, two hundred five thousand, six hundred four".