1603404 has 36 divisors (see below), whose sum is σ = 4422600. Its totient is φ = 485760.

The previous prime is 1603403. The next prime is 1603411. The reversal of 1603404 is 4043061.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a nialpdrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (1603403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1629 + ... + 2420.

It is an arithmetic number, because the mean of its divisors is an integer number (122850).

2^1603404 is an apocalyptic number.

It is an amenable number.

1603404 is an abundant number, since it is smaller than the sum of its proper divisors (2819196).

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

1603404 is a wasteful number, since it uses less digits than its factorization.

1603404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070 (or 4065 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1603404 is about 1266.2558983081. The cubic root of 1603404 is about 117.0435954129.

Adding to 1603404 its reverse (4043061), we get a palindrome (5646465).

The spelling of 1603404 in words is "one million, six hundred three thousand, four hundred four".