1813604 has 12 divisors (see below), whose sum is σ = 3418044. Its totient is φ = 837024.

The previous prime is 1813597. The next prime is 1813613. The reversal of 1813604 is 4063181.

It can be written as a sum of positive squares in 2 ways, for example, as 813604 + 1000000 = 902^2 + 1000^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1813604.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 17387 + ... + 17490.

It is an arithmetic number, because the mean of its divisors is an integer number (284837).

2^1813604 is an apocalyptic number.

It is an amenable number.

1813604 is a deficient number, since it is larger than the sum of its proper divisors (1604440).

1813604 is a wasteful number, since it uses less digits than its factorization.

1813604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34894 (or 34892 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1813604 is about 1346.7011546739. The cubic root of 1813604 is about 121.9497239765.

Adding to 1813604 its reverse (4063181), we get a palindrome (5876785).

The spelling of 1813604 in words is "one million, eight hundred thirteen thousand, six hundred four".