1604789 has 4 divisors (see below), whose sum is σ = 1620780. Its totient is φ = 1588800.

The previous prime is 1604753. The next prime is 1604809. The reversal of 1604789 is 9874061.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1030225 + 574564 = 1015^2 + 758^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604789 - 2¹⁶ = 1539253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604719) 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, 7844 + ... + 8045.

It is an arithmetic number, because the mean of its divisors is an integer number (405195).

2^1604789 is an apocalyptic number.

It is an amenable number.

1604789 is a deficient number, since it is larger than the sum of its proper divisors (15991).

1604789 is a wasteful number, since it uses less digits than its factorization.

1604789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15990.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1604789 is about 1266.8026681374. The cubic root of 1604789 is about 117.0772859710.

The spelling of 1604789 in words is "one million, six hundred four thousand, seven hundred eighty-nine".