1604423 has 4 divisors (see below), whose sum is σ = 1607568. Its totient is φ = 1601280.

The previous prime is 1604419. The next prime is 1604437. The reversal of 1604423 is 3244061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3244061 = 71 ⋅45691.

It is a cyclic number.

It is not a de Polignac number, because 1604423 - 2² = 1604419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1604395 and 1604404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604413) 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, 611 + ... + 1892.

It is an arithmetic number, because the mean of its divisors is an integer number (401892).

2^1604423 is an apocalyptic number.

1604423 is a deficient number, since it is larger than the sum of its proper divisors (3145).

1604423 is an equidigital number, since it uses as much as digits as its factorization.

1604423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3144.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1604423 is about 1266.6582017261. The cubic root of 1604423 is about 117.0683847916.

Adding to 1604423 its reverse (3244061), we get a palindrome (4848484).

The spelling of 1604423 in words is "one million, six hundred four thousand, four hundred twenty-three".