1604065 has 8 divisors (see below), whose sum is σ = 1931688. Its totient is φ = 1278720.

The previous prime is 1604059. The next prime is 1604081. The reversal of 1604065 is 5604061.

It can be written as a sum of positive squares in 4 ways, for example, as 166464 + 1437601 = 408^2 + 1199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1604065 - 2¹⁷ = 1472993 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 2409 + ... + 3001.

It is an arithmetic number, because the mean of its divisors is an integer number (241461).

2^1604065 is an apocalyptic number.

It is an amenable number.

1604065 is a deficient number, since it is larger than the sum of its proper divisors (327623).

1604065 is an equidigital number, since it uses as much as digits as its factorization.

1604065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1604065 is about 1266.5168771082. The cubic root of 1604065 is about 117.0596768637.

It can be divided in two parts, 160 and 4065, that added together give a square (4225 = 65²).

The spelling of 1604065 in words is "one million, six hundred four thousand, sixty-five".