1809604 has 6 divisors (see below), whose sum is σ = 3166814. Its totient is φ = 904800.

The previous prime is 1809601. The next prime is 1809631. The reversal of 1809604 is 4069081.

It can be written as a sum of positive squares in only one way, i.e., 1166400 + 643204 = 1080^2 + 802^2 .

It is not an unprimeable number, because it can be changed into a prime (1809601) 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 as a sum of consecutive naturals, namely, 226197 + ... + 226204.

2^1809604 is an apocalyptic number.

It is an amenable number.

1809604 is a deficient number, since it is larger than the sum of its proper divisors (1357210).

1809604 is a wasteful number, since it uses less digits than its factorization.

1809604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452405 (or 452403 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1809604 is about 1345.2152244158. The cubic root of 1809604 is about 121.8600024499.

The spelling of 1809604 in words is "one million, eight hundred nine thousand, six hundred four".