1604403025 has 9 divisors (see below), whose sum is σ = 1989708123. Its totient is φ = 1283362200.

The previous prime is 1604403011. The next prime is 1604403037. The reversal of 1604403025 is 5203044061.

The square root of 1604403025 is 40055.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 577585089 + 1026817936 = 24033^2 + 32044^2 .

It is not a de Polignac number, because 1604403025 - 2¹³ = 1604394833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 196270 + ... + 204280.

Almost surely, 2^1604403025 is an apocalyptic number.

1604403025 is the 40055-th square number.

1604403025 is the 20028-th centered octagonal number.

It is an amenable number.

1604403025 is a deficient number, since it is larger than the sum of its proper divisors (385305098).

1604403025 is an frugal number, since it uses more digits than its factorization.

1604403025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16032 (or 8016 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The cubic root of 1604403025 is about 1170.6789895738.

Multiplying 1604403025 by its sum of digits (25), we get a square (40110075625 = 200275²).

1604403025 divided by its sum of digits (25) gives a square (64176121 = 8011²).

Adding to 1604403025 its reverse (5203044061), we get a palindrome (6807447086).

The spelling of 1604403025 in words is "one billion, six hundred four million, four hundred three thousand, twenty-five".