1603603 has 4 divisors (see below), whose sum is σ = 1607040. Its totient is φ = 1600168.

The previous prime is 1603601. The next prime is 1603631. The reversal of 1603603 is 3063061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3063061 = 1451 ⋅2111.

It is a cyclic number.

It is not a de Polignac number, because 1603603 - 2¹ = 1603601 is a prime.

It is a Duffinian 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, 883 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (401760).

2^1603603 is an apocalyptic number.

1603603 is a deficient number, since it is larger than the sum of its proper divisors (3437).

1603603 is an equidigital number, since it uses as much as digits as its factorization.

1603603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1603603 is about 1266.3344739839. The cubic root of 1603603 is about 117.0484373433.

Adding to 1603603 its reverse (3063061), we get a palindrome (4666664).

The spelling of 1603603 in words is "one million, six hundred three thousand, six hundred three".