1603604 has 12 divisors (see below), whose sum is σ = 2835924. Its totient is φ = 793344.

The previous prime is 1603601. The next prime is 1603631. The reversal of 1603604 is 4063061.

It can be written as a sum of positive squares in 2 ways, for example, as 960400 + 643204 = 980^2 + 802^2 .

It is a super-3 number, since 3×1603604³ = 12371223339385478592, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1603601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1679 + ... + 2454.

It is an arithmetic number, because the mean of its divisors is an integer number (236327).

2^1603604 is an apocalyptic number.

It is an amenable number.

1603604 is a deficient number, since it is larger than the sum of its proper divisors (1232320).

1603604 is a wasteful number, since it uses less digits than its factorization.

1603604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4234 (or 4232 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1603604 is about 1266.3348688242. The cubic root of 1603604 is about 117.0484616736.

Adding to 1603604 its reverse (4063061), we get a palindrome (5666665).

The spelling of 1603604 in words is "one million, six hundred three thousand, six hundred four".