1604165 has 4 divisors (see below), whose sum is σ = 1925004. Its totient is φ = 1283328.

The previous prime is 1604149. The next prime is 1604167. The reversal of 1604165 is 5614061.

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

It can be written as a sum of positive squares in 2 ways, for example, as 954529 + 649636 = 977^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604165 - 2⁴ = 1604149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1604165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604167) 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, 160412 + ... + 160421.

It is an arithmetic number, because the mean of its divisors is an integer number (481251).

2^1604165 is an apocalyptic number.

It is an amenable number.

1604165 is a deficient number, since it is larger than the sum of its proper divisors (320839).

1604165 is an equidigital number, since it uses as much as digits as its factorization.

1604165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320838.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1604165 is about 1266.5563548457. The cubic root of 1604165 is about 117.0621093762.

The spelling of 1604165 in words is "one million, six hundred four thousand, one hundred sixty-five".