1604625 has 32 divisors (see below), whose sum is σ = 2920320. Its totient is φ = 776000.

The previous prime is 1604621. The next prime is 1604651. The reversal of 1604625 is 5264061.

It is not a de Polignac number, because 1604625 - 2² = 1604621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1604595 and 1604604.

It is not an unprimeable number, because it can be changed into a prime (1604621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3931 + ... + 4319.

It is an arithmetic number, because the mean of its divisors is an integer number (91260).

2^1604625 is an apocalyptic number.

1604625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1604625 is a deficient number, since it is larger than the sum of its proper divisors (1315695).

1604625 is a wasteful number, since it uses less digits than its factorization.

1604625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1604625 is about 1266.7379365915. The cubic root of 1604625 is about 117.0732976318.

Adding to 1604625 its reverse (5264061), we get a palindrome (6868686).

The spelling of 1604625 in words is "one million, six hundred four thousand, six hundred twenty-five".