1604623 has 4 divisors (see below), whose sum is σ = 1631880. Its totient is φ = 1577368.

The previous prime is 1604621. The next prime is 1604651. The reversal of 1604623 is 3264061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3264061 = 1567 ⋅2083.

It is a cyclic number.

It is not a de Polignac number, because 1604623 - 2¹ = 1604621 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 1604594 and 1604603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604621) 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, 13540 + ... + 13657.

It is an arithmetic number, because the mean of its divisors is an integer number (407970).

2^1604623 is an apocalyptic number.

1604623 is a deficient number, since it is larger than the sum of its proper divisors (27257).

1604623 is an equidigital number, since it uses as much as digits as its factorization.

1604623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27256.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1604623 is about 1266.7371471620. The cubic root of 1604623 is about 117.0732489918.

Adding to 1604623 its reverse (3264061), we get a palindrome (4868684).

The spelling of 1604623 in words is "one million, six hundred four thousand, six hundred twenty-three".