1604309 has 12 divisors (see below), whose sum is σ = 1932300. Its totient is φ = 1326528.

The previous prime is 1604299. The next prime is 1604311. The reversal of 1604309 is 9034061.

It can be written as a sum of positive squares in 2 ways, for example, as 442225 + 1162084 = 665^2 + 1078^2 .

It is not a de Polignac number, because 1604309 - 2⁴ = 1604293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 857 + ... + 1985.

It is an arithmetic number, because the mean of its divisors is an integer number (161025).

2^1604309 is an apocalyptic number.

It is an amenable number.

1604309 is a deficient number, since it is larger than the sum of its proper divisors (327991).

1604309 is a wasteful number, since it uses less digits than its factorization.

1604309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172 (or 1165 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1604309 is about 1266.6132006260. The cubic root of 1604309 is about 117.0656120166.

The spelling of 1604309 in words is "one million, six hundred four thousand, three hundred nine".