1604725 has 6 divisors (see below), whose sum is σ = 1989890. Its totient is φ = 1283760.

The previous prime is 1604719. The next prime is 1604731. The reversal of 1604725 is 5274061.

It is an interprime number because it is at equal distance from previous prime (1604719) and next prime (1604731).

It can be written as a sum of positive squares in 3 ways, for example, as 181476 + 1423249 = 426^2 + 1193^2 .

It is not a de Polignac number, because 1604725 - 2⁷ = 1604597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 64189 = 1604725 / (1 + 6 + 0 + 4 + 7 + 2 + 5).

1604725 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1604725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32070 + ... + 32119.

2^1604725 is an apocalyptic number.

It is an amenable number.

1604725 is a deficient number, since it is larger than the sum of its proper divisors (385165).

1604725 is an equidigital number, since it uses as much as digits as its factorization.

1604725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64199 (or 64194 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1604725 is about 1266.7774074398. Note that the first 3 decimals coincide. The cubic root of 1604725 is about 117.0757295783.

Adding to 1604725 its reverse (5274061), we get a palindrome (6878786).

The spelling of 1604725 in words is "one million, six hundred four thousand, seven hundred twenty-five".