1604305 has 4 divisors (see below), whose sum is σ = 1925172. Its totient is φ = 1283440.

The previous prime is 1604299. The next prime is 1604311. The reversal of 1604305 is 5034061.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1604299) and next prime (1604311).

It can be written as a sum of positive squares in 2 ways, for example, as 173889 + 1430416 = 417^2 + 1196^2 .

It is not a de Polignac number, because 1604305 - 2³ = 1604297 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 160426 + ... + 160435.

It is an arithmetic number, because the mean of its divisors is an integer number (481293).

2^1604305 is an apocalyptic number.

It is an amenable number.

1604305 is a deficient number, since it is larger than the sum of its proper divisors (320867).

1604305 is an equidigital number, since it uses as much as digits as its factorization.

1604305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320866.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1604305 is about 1266.6116216110. The cubic root of 1604305 is about 117.0655147238.

Adding to 1604305 its reverse (5034061), we get a palindrome (6638366).

It can be divided in two parts, 160 and 4305, that added together give a triangular number (4465 = T₉₄).

The spelling of 1604305 in words is "one million, six hundred four thousand, three hundred five".