1604393 has 4 divisors (see below), whose sum is σ = 1833600. Its totient is φ = 1375188.

The previous prime is 1604381. The next prime is 1604399. The reversal of 1604393 is 3934061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1604393 - 2⁶ = 1604329 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1604399) 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 in 3 ways as a sum of consecutive naturals, for example, 114593 + ... + 114606.

It is an arithmetic number, because the mean of its divisors is an integer number (458400).

2^1604393 is an apocalyptic number.

It is an amenable number.

1604393 is a deficient number, since it is larger than the sum of its proper divisors (229207).

1604393 is an equidigital number, since it uses as much as digits as its factorization.

1604393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229206.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 1604393 is about 1266.6463594863. The cubic root of 1604393 is about 117.0676551267.

The spelling of 1604393 in words is "one million, six hundred four thousand, three hundred ninety-three".