1604003 has 2 divisors, whose sum is σ = 1604004. Its totient is φ = 1604002.

The previous prime is 1603963. The next prime is 1604017. The reversal of 1604003 is 3004061.

It is an a-pointer prime, because the next prime (1604017) can be obtained adding 1604003 to its sum of digits (14).

It is a strong prime.

It is an emirp because it is prime and its reverse (3004061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1604003 - 2⁸ = 1603747 is a prime.

It is equal to p₁₂₁₄₃₃ and since 1604003 and 121433 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1604093) 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 as a sum of consecutive naturals, namely, 802001 + 802002.

It is an arithmetic number, because the mean of its divisors is an integer number (802002).

2^1604003 is an apocalyptic number.

1604003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604003 is an equidigital number, since it uses as much as digits as its factorization.

1604003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1604003 is about 1266.4924002930. The cubic root of 1604003 is about 117.0581686552.

Adding to 1604003 its reverse (3004061), we get a palindrome (4608064).

The spelling of 1604003 in words is "one million, six hundred four thousand, three".