1800556 has 12 divisors (see below), whose sum is σ = 3228120. Its totient is φ = 878240.

The previous prime is 1800553. The next prime is 1800563. The reversal of 1800556 is 6550081.

It is a self number, because there is not a number n which added to its sum of digits gives 1800556.

It is not an unprimeable number, because it can be changed into a prime (1800551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5326 + ... + 5653.

It is an arithmetic number, because the mean of its divisors is an integer number (269010).

2^1800556 is an apocalyptic number.

It is an amenable number.

1800556 is a deficient number, since it is larger than the sum of its proper divisors (1427564).

1800556 is a wasteful number, since it uses less digits than its factorization.

1800556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11024 (or 11022 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 1800556 is about 1341.8479794671. The cubic root of 1800556 is about 121.6565634529.

The spelling of 1800556 in words is "one million, eight hundred thousand, five hundred fifty-six".