1604520 has 48 divisors (see below), whose sum is σ = 5215860. Its totient is φ = 427776.

The previous prime is 1604513. The next prime is 1604521. The reversal of 1604520 is 254061.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1602756 + 1764 = 1266^2 + 42^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1604493 and 1604502.

It is not an unprimeable number, because it can be changed into a prime (1604521) 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 11 ways as a sum of consecutive naturals, for example, 1869 + ... + 2588.

2^1604520 is an apocalyptic number.

1604520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1604520 is an abundant number, since it is smaller than the sum of its proper divisors (3611340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1604520 is a wasteful number, since it uses less digits than its factorization.

1604520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474 (or 4467 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1604520 is about 1266.6964908770. The cubic root of 1604520 is about 117.0707439792.

Adding to 1604520 its reverse (254061), we get a palindrome (1858581).

The spelling of 1604520 in words is "one million, six hundred four thousand, five hundred twenty".