1604023 has 4 divisors (see below), whose sum is σ = 1612528. Its totient is φ = 1595520.

The previous prime is 1604021. The next prime is 1604051. The reversal of 1604023 is 3204061.

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

It is a cyclic number.

It is not a de Polignac number, because 1604023 - 2¹ = 1604021 is a prime.

It is the 1267-th Hogben number.

It is a Duffinian number.

1604023 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1603988 and 1604006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604021) by changing a digit.

It is a nontrivial repunit in base 1266.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3963 + ... + 4348.

It is an arithmetic number, because the mean of its divisors is an integer number (403132).

2^1604023 is an apocalyptic number.

1604023 is a deficient number, since it is larger than the sum of its proper divisors (8505).

1604023 is an equidigital number, since it uses as much as digits as its factorization.

1604023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8504.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1604023 is about 1266.5002960916. The cubic root of 1604023 is about 117.0586551783.

Adding to 1604023 its reverse (3204061), we get a palindrome (4808084).

The spelling of 1604023 in words is "one million, six hundred four thousand, twenty-three".